{"id":6220,"date":"2017-06-10T23:41:52","date_gmt":"2017-06-10T15:41:52","guid":{"rendered":"http:\/\/www.zhangxinxu.com\/wordpress\/?p=6220"},"modified":"2018-07-24T11:06:31","modified_gmt":"2018-07-24T03:06:31","slug":"html5-web-audio-api-js-ux-voice","status":"publish","type":"post","link":"https:\/\/www.zhangxinxu.com\/wordpress\/2017\/06\/html5-web-audio-api-js-ux-voice\/","title":{"rendered":"\u5229\u7528HTML5 Web Audio API\u7ed9\u7f51\u9875JS\u4ea4\u4e92\u589e\u52a0\u58f0\u97f3"},"content":{"rendered":"<p>by <a href=\"http:\/\/www.zhangxinxu.com\/\">zhangxinxu<\/a> from <a href=\"http:\/\/www.zhangxinxu.com\/wordpress\/?p=6220\">http:\/\/www.zhangxinxu.com\/wordpress\/?p=6220<\/a><br \/>\n\u672c\u6587\u53ef\u5168\u6587\u8f6c\u8f7d\uff0c\u4f46\u9700\u5f97\u5230\u539f\u4f5c\u8005\u4e66\u9762\u8bb8\u53ef\uff0c\u540c\u65f6\u4fdd\u7559\u539f\u4f5c\u8005\u548c\u51fa\u5904\uff0c\u6458\u8981\u5f15\u6d41\u5219\u968f\u610f\u3002<\/p>\n<h3>\u4e00\u3001\u5e9e\u7136\u7684HTML5 Web Audio API<\/h3>\n<p>\u9996\u5148\u52a1\u5fc5\u8981\u5f04\u6e05\u8fd9\u4e00\u70b9\uff0c\u672c\u6587\u8fd9\u91cc\u6240\u8bf4\u7684HTML5 Web Audio API\u548cHTML5 <code>&lt;audio&gt;<\/code>\u5143\u7d20\u5b8c\u5168\u4e0d\u662f\u4e00\u4e2a\u4e1c\u897f\uff0c\u5176\u4f53\u91cf\u4e5f\u5b8c\u5168\u4e0d\u662f\u4e00\u4e2a\u7b49\u7ea7\u7684\uff0cHTML5 Web Audio API\u63a5\u53e3\u7684\u4e30\u5bcc\u7a0b\u5ea6\u548c\u4f53\u91cf\u53ef\u4ee5\u548cHTML canvas API\u76f8\u63d0\u5e76\u8bba\uff0c\u5176\u80fd\u5b9e\u73b0\u7684\u529f\u80fd\u4e5f\u975e\u5e38\u4ee4\u4eba\u77a0\u76ee\u3002<\/p>\n<p>HTML5 Web Audio API\u53ef\u4ee5\u8ba9\u6211\u4eec\u65e0\u4e2d\u751f\u6709\u521b\u9020\u58f0\u97f3\uff0c\u800c\u4e14\u662f\u5404\u79cd\u97f3\u8c03\u7684\u58f0\u97f3\uff0c\u6362\u53e5\u8bdd\u8bf4\uff0c\u6211\u4eec\u901a\u8fc7JavaScript\u5c31\u4f1a\u521b\u5efa\u4e00\u4e2a\u5b8c\u6574\u7684\u97f3\u4e50\u51fa\u6765\uff0c\u7c7b\u4f3c\u5361\u519c\u5c06\u6709\u56fa\u5b9a\u7684\u97f3\u4e50\uff0c\u6216\u662f\u901a\u8fc7\u4e00\u4e9b\u968f\u673a\u7b97\u6cd5\u521b\u5efa\u968f\u673a\u7684\u97f3\u4e50\u90fd\u90fd\u53ef\u4ee5\u7531\u524d\u7aef\u5f00\u53d1\u5de5\u7a0b\u5e08\u6765\u5b8c\u6210\uff08\u4f8b\u5982\u8fd9\u4e2a\u4f7f\u7528Web Audio API\u521b\u5efa<a href=\"https:\/\/codepen.io\/gregh\/pen\/xqWwqz\" target=\"_blank\" rel=\"nofollow\">\u591a\u4e2a\u7ecf\u5178\u6e38\u620f\u80cc\u666f\u97f3\u4e50\u7684\u6848\u4f8b<\/a>\uff09\uff0c\u5982\u679c\u518d\u914d\u5408\u4e00\u70b9\u4eba\u5de5\u667a\u80fd\u7684\u4e1c\u897f\uff0c\u6211\u4eec\u8bf4\u4e0d\u5b9a\u53ef\u4ee5\u9020\u51fa\u4e00\u4e2a\u4eba\u5de5\u667a\u80fd\u97f3\u4e50\u751f\u6210\u5de5\u5177\u3002<\/p>\n<p>\u5f53\u7136\u5176\u529f\u80fd\u7edd\u4e0d\u4ec5\u9650\u4e8e\u8fd9\u4e00\u70b9\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\uff1a<\/p>\n<ul>\n<li>\u5bf9\u7b80\u5355\u6216\u590d\u6742\u7684\u58f0\u97f3\u8fdb\u884c\u6df7\u5408\uff1b<\/li>\n<li>\u7cbe\u786e\u63a7\u5236\u58f0\u97f3\u7684\u5bc6\u5ea6\u548c\u8282\u594f\uff1b<\/li>\n<li>\u5185\u7f6e\u6de1\u5165\/\u6de1\u51fa\uff0c\u9897\u7c92\u566a\u70b9\uff0c\u97f3\u8c03\u63a7\u5236\u7b49\u6548\u679c\uff1b<\/li>\n<li>\u7075\u6d3b\u7684\u5904\u7406\u5728\u97f3\u9891\u6d41\u7684\u58f0\u9053\uff0c\u4f7f\u5b83\u4eec\u6210\u4e3a\u62c6\u5206\u548c\u5408\u5e76\uff1b<\/li>\n<li>\u5904\u7406\u4ece<code>&lt;audio&gt;<\/code>\u97f3\u9891\u6216<code>&lt;video&gt;<\/code>\u89c6\u9891\u7684\u5a92\u4f53\u5143\u7d20\u7684\u97f3\u9891\u6e90\uff1b<\/li>\n<li>\u4f7f\u7528MediaStream\u7684getUserMedia()\u65b9\u6cd5\u4e8b\u5b9e\u5904\u7406\u73b0\u573a\u8f93\u5165\u7684\u97f3\u9891\uff0c\u4f8b\u5982\u53d8\u58f0\uff1b<\/li>\n<li>\u7acb\u4f53\u97f3\u6548\uff0c\u53ef\u4ee5\u652f\u6301\u591a\u79cd3D\u6e38\u620f\u548c\u6c89\u6d78\u5f0f\u73af\u5883\uff1b<\/li>\n<li>\u5229\u7528\u5377\u79ef\u5f15\u64ce\uff0c\u521b\u5efa\u5404\u7c7b\u7ebf\u6027\u97f3\u6548\uff0c\u4f8b\u5982\u5c0f\/\u5927\u623f\u95f4\u3001\u5927\u6559\u5802\u3001\u97f3\u4e50\u5385\u3001\u6d1e\u7a74\u3001\u96a7\u9053\u3001\u8d70\u5eca\u3001\u68ee\u6797\u3001\u5706\u5f62\u5267\u573a\u7b49\u3002\u5c24\u5176\u9002\u7528\u4e8e\u521b\u5efa\u9ad8\u8d28\u91cf\u7684\u623f\u95f4\u6548\u679c\u3002<\/li>\n<li>\u9ad8\u6548\u7684\u5b9e\u65f6\u7684\u65f6\u57df\u548c\u9891\u5206\u6790\uff0c\u914d\u5408CSS3\u6216Canvas\u6216webGL\u53ef\u4ee5\u5b9e\u73b0\u97f3\u4e50\u53ef\u89c6\u5316\u652f\u6301\uff1b<\/li>\n<li>\u4ee5\u53ca\u5176\u4ed6\u591a\u79cd\u97f3\u9891\u6ce2\u5f62\u7b97\u6cd5\u63a7\u5236\uff0c\u51e0\u4e4e\u5c31\u662f\u628a\u4e00\u4e2a\u97f3\u9891\u7f16\u8f91\u7c7b\u8f6f\u4ef6\u642c\u5230web\u4e0a\u3002<\/li>\n<\/ul>\n<p>\u4f46\u662f\u5bf9\u5927\u591a\u6570\u7684Web\u5f00\u53d1\u4eba\u5458\uff0c\u6211\u4eec\u5e76\u4e0d\u9700\u8981\u548c\u97f3\u9891\u6253\u4ea4\u9053\u8fd9\u4e48\u6df1\uff0c\u56e0\u4e3a\u6bd5\u7adf\u4e0d\u662f\u505a\u97f3\u4e50\u7f51\u7ad9\u7684\uff0c\u6b64\u65f6\uff0c\u90a3\u4e9b\u5f88\u9ad8\u7ea7\u7684HTML5 Web Audio API\u529f\u80fd\u5c31\u79bb\u6211\u4eec\u5b9e\u9645\u5de5\u4f5c\u7684\u4ef7\u503c\u6709\u4e9b\u8fdc\uff0c\u5982\u679c\u8d38\u7136\u82b1\u5927\u91cf\u65f6\u95f4\u53bb\u6df1\u5165\u5b66\u4e60\u5176\u5b9e\u662f\u4e00\u4ef6\u6295\u5165\u4ea7\u51fa\u6bd4\u5f88\u4f4e\u7684\u4e8b\u60c5\u3002\u5f53\u7136\uff0c\u6211\u8fd9\u79cd\u62c5\u5fc3\u5b9e\u9645\u4e0a\u662f\u591a\u4f59\u7684\uff0c\u201c\u8d38\u7136\u82b1\u5927\u91cf\u65f6\u95f4\u53bb\u6df1\u5165\u5b66\u4e60\uff1f\u201d\u641e\u53cd\u4e86\u5427\uff0c\u5176\u5b9e\u771f\u5b9e\u7684\u73b0\u72b6\u662f\u5f00\u53d1\u4eba\u5458\u5bf9\u6b64\u9e1f\u90fd\u4e0d\u9e1f\uff0c\u770b\u90fd\u4e0d\u770b\u3002\u4e00\u6765\u56e0\u4e3a\u6bd5\u7adf\u4e0d\u706b\u561b\uff0c\u4e8c\u6765\u8d44\u6599\u5c11\u770b\u4e0d\u61c2\u561b\uff0c\u4e09\u6765\u81ea\u5df1\u9879\u76ee\u5f88\u5c11\u6709\u58f0\u97f3\u6253\u4ea4\u9053\uff0c\u5b66\u4e86\u4e5f\u767d\u5b66\u3002<\/p>\n<p>\u8003\u8651\u5230\u8fd9\u79cd\u73b0\u72b6\uff0c\u5982\u679c\u672c\u6587\u5185\u5bb9\u6d0b\u6d0b\u6d12\u6d12\u8bb2\u5404\u79cdapi\uff0c\u4f30\u8ba1\u5f88\u591a\u4eba\u779f\u4e24\u773c\u5c31\u76f4\u89c2\u628a\u9875\u9762\u5173\u6389\u4e86\uff0c\u6240\u4ee5\u63a5\u4e0b\u6765\u6211\u4eec\u4ece\u4e00\u4e2a\u6700\u7b80\u5355\u6700\u5c0f\u7684\u800c\u4e14\u975e\u5e38\u5b9e\u7528\u7684\u6848\u4f8b\u6765\u6162\u6162\u89e3\u5f00HTML5 Web Audio API\u7684\u9762\u7eb1\u3002<\/p>\n<h3>\u4e8c\u3001HTML5 Web Audio API\u7ed9\u7f51\u9875\u4ea4\u4e92\u589e\u52a0\u58f0\u97f3<\/h3>\n<p>\u5148\u6765\u770b\u5b9e\u4f8b\u6548\u679c\uff0c\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a<a href=\"http:\/\/www.zhangxinxu.com\/study\/201706\/button-hover-web-audio.html\" target=\"_blank\">\u9f20\u6807hover\u6309\u94ae\u65e0\u4e2d\u751f\u6709\u64ad\u653e\u58f0\u97f3demo<\/a><\/p>\n<p>\u5f53\u6211\u4eec\u9f20\u6807hover\u4e0b\u56fe\u6240\u793a\u7684\u6309\u94ae\u7684\u65f6\u5019\uff0c\u5728\u975eIE\u6d4f\u89c8\u5668\u4e0b\uff0c\u5c31\u4f1a\u64ad\u653e\u51fa\u7c7b\u4f3c\u7535\u5b50\u7434\u7434\u952e\u6309\u4e0b\u7684\u58f0\u97f3\uff0c\u800c\u4e14\u6bcf\u6b21hover\u7684\u65f6\u5019\uff0c\u97f3\u8c03\u90fd\u4f1a\u53d1\u751f\u6709\u89c4\u5f8b\u7684\u53d8\u5316\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201706\/2017-06-10_211156.png\" width=\"409\" height=\"210\" alt=\"\u7ecf\u8fc7\u6309\u94ae\u64ad\u653e\u58f0\u97f3\u622a\u56fe\" class=\"alignnone\" \/><\/p>\n<p>\u4e0b\u9762\u8fd9\u53e5\u8bdd\u662f\u91cd\u70b9\uff0cdemo\u9875\u9762\u4e2d\u64ad\u653e\u7684<strong>\u58f0\u97f3\u662f\u786c\u4ef6\u81ea\u52a8\u751f\u6210<\/strong>\u7684\uff0c\u4e0d\u662f\u8c03\u7528\u73b0\u6210\u7684mp3\u97f3\u9891\u64ad\u653e\u51fa\u6765\u7684\u3002<\/p>\n<p>\u6362\u79cd\u8bf4\u6cd5\u5c31\u662f\uff1a\u65e0\u9700\u4efb\u4f55\u97f3\u9891\u6587\u4ef6\uff0c\u53ea\u9700\u8981\u51e0\u884cJS\u4ee3\u7801\uff0c\u6211\u4eec\u5c31\u80fd\u8ba9\u7f51\u9875\u53d1\u51fa\u5404\u79cd\u5404\u6837\u7684\u97f3\u8c03\u3002<\/p>\n<p>10\u5e74\u524d\uff0cflash\u70ab\u9177\u7f51\u9875\u98ce\u5174\u8d77\u7684\u65f6\u5019\uff0c\u4ea4\u4e92\u97f3\u6548\u662f\u975e\u5e38\u666e\u904d\u7684\uff0c\u53ef\u4ee5\u8bf4\u662fflash\u9177\u7ad9\u5fc5\u5907\u5143\u7d20\u3002\u53ea\u662f\u540e\u6765flash\u8870\u843d\u4e86\uff0c\u800cweb\u5bf9\u4e8e\u591a\u5a92\u4f53\u8d44\u6e90\u7684\u652f\u6301\u957f\u4e45\u4ee5\u6765\u662f\u6bd4\u8f83\u5f31\u7684\uff0c\u4e8e\u662fWeb\u7f51\u7ad9\u5168\u90e8\u90fd\u662f\u5b89\u5b89\u9759\u9759\u7684\u3002\u5728\u79fb\u52a8\u7aef\uff0cH5\u5e7f\u544a\u8425\u9500\u6027\u8d28\u7684\u7f51\u9875\u90fd\u662f\u97f3\u9891\u7528\u7684\u6bd4\u8f83\u591a\uff0c\u4f46\u5927\u591a\u90fd\u662f\u4f5c\u4e3a\u80cc\u666f\u97f3\u4e50\u4f7f\u7528\u7684\uff0c\u4ea4\u4e92\u65f6\u5019\u5176\u5b9e\u7528\u7684\u5e76\u4e0d\u591a\u3002\u6211\u60f3\uff0c\u53ef\u80fd\u4e0e\u5927\u591a\u6570\u5f00\u53d1\u5e76\u4e0d\u77e5\u9053HTML5 Web Audio API\u53ef\u4ee5\u76f4\u63a5\u5f04\u51fa\u58f0\u97f3\uff0c\u77e5\u8bc6\u7684\u5e7f\u5ea6\u5c40\u9650\u4e86\u6280\u672f\u7684\u9009\u578b\u3002<\/p>\n<p>\u4e8e\u662f\u6211\u5c31\u60f3\u5230\uff0cHTML5 Web Audio API\u63d0\u53ca\u7684\u4eba\u4e0d\u591a\uff0c\u4f7f\u7528\u5e76\u4e0d\u706b\uff0c\u5e76\u4e0d\u4e00\u5b9a\u662f\u56e0\u4e3a\u8fd9\u4e2a\u6280\u672f\u672c\u8eab\u7684\u5c40\u9650\u6216\u8005\u4f7f\u7528\u573a\u666f\u4e0d\u591a\uff0c\u800c\u662f\u5177\u6709\u8f83\u5927\u5f71\u54cd\u529b\u7684\u4eba\uff0c\u793e\u533a\u6216\u4f01\u4e1a\u5e76\u6ca1\u6709\u5728\u8fd9\u4e00\u5757\u8eab\u5148\u58eb\u5352\u8fdb\u884c\u63a8\u52a8\u3002\u5f88\u591a\u4f01\u4e1a\u7684\u5b98\u7f51\u3001\u4ea7\u54c1\u5ba3\u4f20\u9875\uff0c\u5e7f\u544a\u8425\u9500\u6027\u8d28\u7684\u4e13\u9898\u6d3b\u52a8\u975e\u5e38\u8bb2\u6c42\u70ab\u9177\uff0c\u97f3\u89c6\u9891\u5c42\u51fa\u4e0d\u7a77\uff0c\u5f88\u663e\u7136\uff08\u53c2\u8003flash\u65f6\u4ee3\uff09\uff0c\u4ea4\u4e92\u97f3\u6548\u4e5f\u5176\u5b9e\u662f\u975e\u5e38\u6b22\u8fce\u7684\uff0c\u53ea\u662f\u6280\u672f\u773c\u754c\u7684\u5c40\u9650\u8ba4\u4e3a\u9700\u8981\u4e13\u95e8\u7684mp3\/wav\u97f3\u9891\u8c03\u7528\u6210\u672c\u9ad8\u800c\u4e0d\u4f7f\u7528\u7f62\u4e86\u3002<\/p>\n<p>HTML5 Web Audio API\u53ef\u4ee5\u76f4\u63a5\u4ea7\u751f\u58f0\u97f3\uff0c\u5e76\u4e14\u53ef\u4ee5\u968f\u610f\u63a7\u5236\u97f3\u8c03\uff0c\u65f6\u957f\u4ee5\u53ca\u6de1\u5165\u6de1\u51fa\u7b49\u6548\u679c\uff0c\u66f4\u5f3a\u5927\u66f4\u7075\u6d3b\u3002\u800c\u8fd9\u4e2a\u529f\u80fd\u70b9\u662fHTML5 Web Audio API\u4e2d\u6700\u7b80\u5355\u6700\u57fa\u672c\u4e5f\u662f\u6700\u5b9e\u7528\u7684\uff0c\u6ca1\u6709\u7406\u7531\u4e0d\u7ed9web\u5f00\u53d1\u5e26\u6765\u4ea4\u4e92\u97f3\u6548\u70ed\u6f6e\u3002<\/p>\n<h3>\u4e09\u3001\u7f51\u9875\u4ea4\u4e92\u97f3\u6548AudioContext\uff0cAudioParam\u7b49API\u4ecb\u7ecd<\/h3>\n<p>\u4e0b\u9762\u5c31\u662f\u58f0\u97f3\u51fa\u73b0\u7684JS\u76f8\u5173\u4ee3\u7801\uff1a<\/p>\n<pre>\n<span style=\"color:green;\">1.<\/span>  window.AudioContext = window.AudioContext || window.webkitAudioContext;\n<span style=\"color:green;\">2.<\/span>  var audioCtx = new AudioContext();\n<span style=\"color:green;\">3.<\/span>  var oscillator = audioCtx.createOscillator();\n<span style=\"color:green;\">4.<\/span>  var gainNode = audioCtx.createGain();\n<span style=\"color:green;\">5.<\/span>  oscillator.connect(gainNode);\n<span style=\"color:green;\">6.<\/span>  gainNode.connect(audioCtx.destination);\n<span style=\"color:green;\">7.<\/span>  oscillator.type = 'sine';\n<span style=\"color:green;\">8.<\/span>  oscillator.frequency.value = 196.00;\n<span style=\"color:green;\">9.<\/span>  gainNode.gain.setValueAtTime(0, audioCtx.currentTime);\n<span style=\"color:green;\">10.<\/span> gainNode.gain.linearRampToValueAtTime(1, audioCtx.currentTime + 0.01);\n<span style=\"color:green;\">11.<\/span> oscillator.start(audioCtx.currentTime);\n<span style=\"color:green;\">12.<\/span> gainNode.gain.exponentialRampToValueAtTime(0.001, audioCtx.currentTime + 1);\n<span style=\"color:green;\">13.<\/span> oscillator.stop(audioCtx.currentTime + 1);\n<\/pre>\n<p>\u603b\u517113\u884c\u4ee3\u7801\uff0c\u867d\u7136\u884c\u6570\u4e0d\u591a\uff0c\u4f46\u5176\u4e2d\u51fa\u73b0\u7684API\u6570\u91cf\u4ee5\u53ca\u5176\u4e2d\u7684\u542b\u4e49\u8fd8\u662f\u6709\u70b9\u539a\u5ea6\u7684\u3002<\/p>\n<p>\u6211\u4eec\u4e00\u884c\u4e00\u884c\u6765\u770b\u3002<\/p>\n<p><strong>1. window.AudioContext = window.AudioContext || window.webkitAudioContext<\/strong><br \/>\n\u6ca1\u5565\u597d\u8bf4\u7684\uff0c\u5411\u524d\u517c\u5bb9\u4e00\u4e0b\u8001\u7684<code>webkit<\/code>\u6d4f\u89c8\u5668\u3002<\/p>\n<p><strong>2. var audioCtx = new AudioContext()<\/strong><br \/>\n<code>AudioContext<\/code>\u662fHTML5 Web Audio\u6700\u57fa\u7840\u4f30\u8ba1\u4e5f\u662f\u6700\u5e38\u7528\u7684API\u4e86\uff0c\u5176\u89d2\u8272\u548c\u5730\u4f4d\u53ef\u4ee5\u548cCanvas\u7684<code>canvas.getContext<\/code>\u4e00\u62fc\u3002\u987e\u540d\u601d\u4e49\uff0c\u6307\u5b9a\u4e00\u4e2a\u97f3\u9891\u4e0a\u4e0b\u6587\uff0c\u5305\u542b\u5927\u91cf\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\uff0c\u800c\u4e14\u8fd9\u4e9b\u65b9\u6cd5\u540d\u53c8\u591a\u53c8\u957f\uff0c\u6839\u672c\u5c31\u8bb0\u4e0d\u4f4f\uff0c\u968f\u4fbf\u622a\u4e2a\u56fe\u611f\u53d7\u4e00\u4e0b<img decoding=\"async\" src=\"http:\/\/mat1.gtimg.com\/www\/mb\/images\/face\/34.gif\" align=\"absmiddle\">\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201706\/2017-06-10_215712.png\" width=\"707\" height=\"469\" alt=\"AudioContext\u65b9\u6cd5\u540d\u622a\u56fe\" class=\"alignnone\" \/><\/p>\n<p>\u6240\u4ee5\uff0c\u5fc5\u987b\u8981\u6709\u6587\u6863\uff1a<a href=\"https:\/\/developer.mozilla.org\/zh-CN\/docs\/Web\/API\/AudioContext\" target=\"_blank\">MDN-AudioContext<\/a><\/p>\n<p>\u4f46\uff0c\u4e0d\u8981\u6015\uff0c\u5bf9\u4e8e\u7b80\u5355\u7684\u97f3\u8c03\u64ad\u653e\uff0c\u6211\u4eec\u53ea\u9700\u8981\u5173\u5fc3\u4e0b\u9762\u51e0\u4e2a\u5c5e\u6027\u548c\u65b9\u6cd5\u5c31\u597d\u4e86\uff0c\u4e0a\u9762\u90a3\u4e48\u591a\u9ad8\u7ea7\u7684\u4e1c\u897f\u90fd\u662f\u7559\u7ed9\u9700\u8981\u6df1\u5165\u548c\u97f3\u9891\u6253\u4ea4\u9053\u7684\u5f00\u53d1\u4eba\u5458\u7528\u7684\u3002<\/p>\n<p><strong>3. var oscillator = audioCtx.createOscillator();<\/strong><br \/>\n<code>createOscillator()<\/code>\u662f<code>AudioContext<\/code>\u7684\u4e00\u4e2a\u65b9\u6cd5\uff0c\u521b\u5efa\u4e00\u4e2a<a href=\"https:\/\/developer.mozilla.org\/zh-CN\/docs\/Web\/API\/OscillatorNode\" target=\"_blank\">OscillatorNode<\/a>\u3002 <code>OscillatorNode<\/code>\u8868\u793a\u4e00\u4e2a\u5468\u671f\u6027\u6ce2\u5f62\uff0c\u6bd4\u5982\u4e00\u4e2a\u6b63\u5f26\u6ce2\uff08\u5c31\u662f\u4e0a\u4e0b\u5f2f\u5f2f\u7684\u90a3\u4e2a\u6ce2\uff09\uff0c\u5927\u5bb6\u5e94\u8be5\u90fd\u77e5\u9053\u58f0\u97f3\u672c\u8d28\u5176\u5b9e\u5c31\u662f\u9707\u52a8\uff0c\u662f\u548c\u6ce2\u5f62\u7d27\u5bc6\u5173\u8054\u7684\uff0c\u56e0\u6b64\u6ce2\u5f62\u4e0d\u4e00\u6837\uff0c\u6700\u7ec8\u7684\u58f0\u97f3\u4e5f\u5c31\u4e0d\u4e00\u6837\uff0c\u4f8b\u5982\u6709\u7684\u6ce2\u5f62\u662f\u201c\u54d4\u54d4\u54d4&#8230;\u201d\uff0c\u6709\u7684\u6ce2\u5f62\u51fa\u6765\u7684\u662f\u201c\u561f\u545c\u545c&#8230;\u201d\u3002\u6ce2\u8fd8\u53d7\u9891\u7387\u5f71\u54cd\uff0c\u6700\u7ec8\u8868\u73b0\u4e3a\u4e0d\u4e00\u6837\u7684\u97f3\u8c03\u9ad8\u4f4e\u3002\u56e0\u6b64\uff0c<code>OscillatorNode<\/code>\u5c31\u6709<code>frequency<\/code>\u548c<code>type<\/code>\u4e0b\u97622\u4e2a\u5373\u5c06\u767b\u573a\u7684\u5c5e\u6027\u3002<\/p>\n<p>\u603b\u4e4b\uff0c\u8fd9\u91cc\u7684\u53d8\u91cf<code>oscillator<\/code>\u57fa\u672c\u4e0a\u6765\u8bf4\u521b\u9020\u4e86\u4e00\u4e2a\u97f3\u8c03\u3002<\/p>\n<p><strong>4. var gainNode = audioCtx.createGain()<\/strong><br \/>\n<code>createGain()<\/code>\u4e5f\u662f<code>AudioContext<\/code>\u7684\u4e00\u4e2a\u65b9\u6cd5\uff0c\u521b\u5efa\u4e00\u4e2a<a href=\"https:\/\/developer.mozilla.org\/zh-CN\/docs\/Web\/API\/GainNode\" target=\"_blank\">GainNode<\/a>\uff0c\u5b83\u53ef\u4ee5\u63a7\u5236\u97f3\u9891\u7684\u603b\u97f3\u91cf\u3002\u4e5f\u5c31\u662f\u8bf4<code>createOscillator()<\/code>\u63a7\u5236\u97f3\u8c03\uff0c<code>createGain()<\/code>\u63a7\u5236\u97f3\u91cf\uff0c\u4e92\u76f8\u914d\u5408\uff0c\u9ec4\u91d1\u642d\u6863\u3002<\/p>\n<p><code>GainNode<\/code>\u53ea\u6709\u4e00\u4e2a\u7b80\u5355\u7684\u53ea\u8bfb\u5c5e\u6027\uff0c\u540d\u4e3a<code>gain<\/code>\uff0c\u5b8c\u6574\u4e66\u5199<code>GainNode.gain<\/code>\uff0c\u672c\u8eab\u6ca1\u4ec0\u4e48\uff0c\u4f46\u662f<code>GainNode.gain<\/code>\u7684\u8fd4\u56de\u503c\u53ef\u662f\u4e2a\u5927\u5bb6\u4f19\uff0c\u662f\u4e2a<code><em>a-rate<\/em><\/code>\u7c7b\u578b\u7684<a href=\"https:\/\/developer.mozilla.org\/zh-CN\/docs\/Web\/API\/AudioParam\" target=\"_blank\">AudioParam<\/a>\u3002<\/p>\n<p><code>AudioParam<\/code>\u603b\u5171\u67092\u4e2a\u7c7b\u578b\uff0c\u4e00\u4e2a\u662f<code><em>a-rate<\/em><\/code>\u8fd8\u6709\u4e00\u4e2a\u662f<code><em>k-rate<\/em><\/code>\uff0c\u524d\u8005<code>AudioParam<\/code>\u4e3a\u97f3\u9891\u4fe1\u53f7\u6bcf\u4e2a\u6837\u54c1\u5e27\u7684\u5f53\u524d\u58f0\u97f3\u53c2\u6570\u503c\uff1b\u540e\u8005\u7684<code>AudioParam<\/code>\u4f7f\u7528\u6574\u4e2a\u5757\uff08\u5373128\u4e2a\u6837\u672c\u5e27\uff09\u76f8\u540c\u7684\u521d\u59cb\u97f3\u9891\u53c2\u6570\u503c\u3002<\/p>\n<p><code>AudioParam<\/code>\u5305\u542b\u8bf8\u591a\u5c5e\u6027\u548c\u65b9\u6cd5\uff0c\u90fd\u662f\u4e0e\u97f3\u91cf\u63a7\u5236\u76f8\u5173\u7684\u3002<\/p>\n<p><strong>5. oscillator.connect(gainNode)<\/strong><br \/>\n\u97f3\u8c03\u548c\u97f3\u91cf\u5173\u8054\u3002<\/p>\n<p><strong>6. gainNode.connect(audioCtx.destination)<\/strong><br \/>\n\u8fd9\u91cc\u7684<code>audioCtx.destination<\/code>\u8fd4\u56de<a href=\"https:\/\/developer.mozilla.org\/zh-CN\/docs\/Web\/API\/AudioDestinationNode\" target=\"_blank\">AudioDestinationNode<\/a>\u5bf9\u8c61\uff0c<code>AudioDestinationNode<\/code>\u63a5\u53e3\u8868\u793a\u97f3\u9891\u56fe\u5f62\u5728\u7279\u5b9a\u60c5\u51b5\u4e0b\u7684\u6700\u7ec8\u8f93\u51fa\u5730\u5740 &#8211; \u901a\u5e38\u4e3a\u626c\u58f0\u5668\u3002\u8bdd\u53e5\u8bdd\u8bf4\u5c31\u662f\u548c\u97f3\u9891\u8bbe\u5907\u5173\u8054\u3002<\/p>\n<p>\u8fd9\u4e2a\u5173\u8054\u4e3aaudio context\u4e2d\u6240\u6709\u8282\u70b9\u7684\u6700\u7ec8\u8282\u70b9\uff0c\u770b\u4e0b\u9762\u7684\u5de5\u4f5c\u6d41\u56fe\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201706\/workflow-s.png\" width=\"500\" height=\"32\" alt=\"audio context\u5de5\u4f5c\u6d41\" class=\"alignnone\" \/><\/p>\n<p><strong>7. oscillator.type = &#8216;sine&#8217;<\/strong><br \/>\n\u6211\u4eec\u7684\u58f0\u97f3\u6ce2\u5f62\u6307\u5b9a\u4e3a<code>'sine'<\/code>\uff0c\u4e5f\u5c31\u662f\u6b63\u5f26\u6ce2\uff0c\u8fd8\u652f\u6301\u5176\u4ed63\u79cd\u6ce2\u5f62\uff0c\u4e3a<code>'square'<\/code>\u65b9\u6ce2\uff0c<code>'triangle'<\/code>\u4e09\u89d2\u6ce2\u4ee5\u53ca<code>'sawtooth'<\/code>\u952f\u9f7f\u6ce2\u3002\u5f62\u72b6\u5982\u4e0b\u56fe\uff08\u56fe\u6765\u81ea<a href=\"https:\/\/css-tricks.com\/introduction-web-audio-api\/\" target=\"_blank\" rel=\"nofollow\">css-tricks<\/a>\uff09<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201706\/2017-06-10_223950.png\" width=\"480\" height=\"355\" alt=\"4\u79cd\u9ed8\u8ba4\u7684\u6ce2\u5f62\u56fe\" class=\"alignnone\" \/><\/p>\n<p>\u4e0b\u9762\u8fd9\u4e2aCodepen\u53ef\u4ee5\u611f\u53d74\u4e2d\u6ce2\u5f62\u5e26\u6765\u7684\u54d4\u54d4\u5575\u5575\u7684\u58f0\u97f3\uff1a<\/p>\n<p><iframe height='256' scrolling='no' title='Web Audio API: waveforms' src='\/\/codepen.io\/gregh\/embed\/LxJEaj\/?height=256&#038;theme-id=0&#038;default-tab=result&#038;embed-version=2' frameborder='no' allowtransparency='true' allowfullscreen='true' style='width: 100%;'>See the Pen <a href='https:\/\/codepen.io\/gregh\/pen\/LxJEaj\/'>Web Audio API: waveforms<\/a>\u4f5c\u8005\uff1a Greg Hovanesyan (<a href='https:\/\/codepen.io\/gregh'>@gregh<\/a>)<\/a>.<br \/>\n<\/iframe><\/p>\n<p>\u4ee5\u4e0a\u56db\u79cd\u6ce2\u5f62\u662f\u5185\u7f6e\u7684\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528<code>setPeriodicWave()<\/code>\u65b9\u6cd5\u81ea\u5b9a\u4e49\u6ce2\u5f62\u3002<\/p>\n<p><strong>8. oscillator.frequency.value = 196.00<\/strong><br \/>\n\u8bbe\u7f6e\u6ce2\u5f62\u7684\u9891\u7387\uff0c\u5b9e\u9645\u4e0a\uff0c\u53ef\u4ee5\u7406\u89e3\u4e3a\u8bbe\u7f6e\u58f0\u97f3\u7684\u97f3\u8c03\uff0c\u4e5f\u5c31\u662f\u8bbe\u7f6e\u6700\u540e\u7684\u58f0\u97f3\u662f\u201c\u591a\u745e\u7c73\u53d1\u55e6\u5566\u897f\u201d\u5176\u4e2d\u7684\u4e00\u4e2a\u3002\u6570\u503c\u8d8a\u5c0f\uff0c\u58f0\u97f3\u8d8a\u4f4e\u6c89\uff0c\u8d8a\u5927\u63d0\u7434\uff1b\u6570\u503c\u8d8a\u5927\uff0c\u58f0\u97f3\u8d8a\u6e05\u8106\uff0c\u8d8a\u5c0f\u63d0\u7434\u3002<\/p>\n<p>demo\u9875\u9762\u4e2d\u7684\u97f3\u8c03\u5b8c\u6574\u8303\u56f4\u5982\u4e0b\uff1a<\/p>\n<pre>[196.00, 220.00, 246.94, 261.63, 293.66, 329.63, 349.23, 392.00, 440.00, 493.88, 523.25, 587.33, 659.25, 698.46, 783.99, 880.00, 987.77, 1046.50]<\/pre>\n<p>\u6bcf\u6b21\u9f20\u6807hover\u6211\u90fd\u4f1a\u53d8\u6362\u4e00\u4e2a\u9891\u7387\uff0c\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u6bcf\u6b21\u7ecf\u8fc7\u6309\u94ae\u5c31\u4f1a\u542c\u5230\u6709\u89c4\u5f8b\u7684\u97f3\u8c03\u53d8\u5316\u3002<\/p>\n<p><strong>9. gainNode.gain.setValueAtTime(0, audioCtx.currentTime)<\/strong><br \/>\n\u5148\u6765\u4e86\u89e3\u4e0b<code>audioCtx.currentTime<\/code>\uff0c\u5176\u503c\u662f\u4ee5\u53cc\u7cbe\u5ea6\u6d6e\u70b9\u578b\u6570\u5b57\u8fd4\u56de\u786c\u4ef6\u8c03\u7528\u7684\u79d2\u6570\u3002\u53ea\u8bfb\uff0c\u4e5f\u5c31\u662f\u8bf4\u8fd9\u4e2a\u65f6\u95f4\u4f60\u662f\u65e0\u6cd5\u6539\u53d8\u7684\uff0c\u65e0\u8bba\u662f\u6682\u505c\u6216\u8005\u91cd\u7f6e\u90fd\u4e0d\u53ef\u4ee5\u3002\u5f53\u6211\u4eec\u4f7f\u7528\u7c7b\u4f3c<code>new AudioContext()<\/code>\u521b\u5efa<code>AudioContext<\/code>\u7684\u65f6\u5019\uff0c\u8fd9\u4e2a\u65f6\u95f4\u5c31\u53ef\u4ee5\u4ece<code>0<\/code>\u5f00\u59cb\u8d70\u4e86\uff0c\u7136\u540e\u5c31\u50cf\u79bb\u5f26\u7684\u7bad\uff0c\u4e00\u76f4\u4e0d\u56de\u5934\u3002<\/p>\n<p><code>gainNode.gain<\/code>\u8fd9\u4e2a\u524d\u9762\u4ecb\u7ecd\u8fc7\u4e86\uff0c\u8fd4\u56de\u7684\u662f<code>AudioParam<\/code>\uff0c\u6240\u4ee5\u8fd9\u91cc\u5b9e\u9645\u4e0a\u6267\u884c\u7684\u662f<code>AudioParam.setValueAtTime()<\/code>\u65b9\u6cd5\uff0c\u6b64\u65b9\u6cd5\u652f\u6301\u4e24\u4e2a\u53c2\u6570\uff0c\u4e00\u4e2a\u662f\u97f3\u91cf\uff08\u8303\u56f40~1\uff09\uff0c\u4e00\u4e2a\u65f6\u95f4\uff0c\u8fd9\u91cc<code>setValueAtTime(0, audioCtx.currentTime)<\/code>\u8868\u793a\u5f53\u4e0b\u5c31\u628a\u97f3\u91cf\u8bbe\u4e3a<code>0<\/code>\uff0c\u4e5f\u5c31\u662f\u6ca1\u58f0\u97f3\uff0c\u56e0\u4e3a\u5feb\u901f\u9f20\u6807hover\u65f6\u5019\uff0c\u4e4b\u524d\u58f0\u97f3\u53ef\u80fd\u8fd8\u6ca1\u64ad\u653e\u7ed3\u675f\uff0c\u9700\u8981\u4ece<code>0<\/code>\u5f00\u59cb\u3002<\/p>\n<p><strong>10. gainNode.gain.linearRampToValueAtTime(1, audioCtx.currentTime + 0.01)<\/strong><br \/>\n<code>linearRampToValueAtTime()<\/code>\u65b9\u6cd5\u8868\u793a\u97f3\u91cf\u5728\u67d0\u65f6\u95f4\u7ebf\u6027\u53d8\u5316\u5230\u67d0\u503c\uff0c\u8fd9\u91cc<code>linearRampToValueAtTime(1, audioCtx.currentTime + 0.01)<\/code>\u5b9e\u9645\u4e0a\u8868\u793a\u7684\u662f\u5728<code>0.01<\/code>\u79d2\u7684\u65f6\u95f4\u5185\uff0c\u58f0\u97f3\u97f3\u91cf\u7ebf\u6027\u4ece<code>0<\/code>\u5230<code>1<\/code>\u3002<\/p>\n<p><strong>11. oscillator.start(audioCtx.currentTime)<\/strong><br \/>\n\u5f00\u59cb\u51fa\u58f0\u5566\u2026\u2026<\/p>\n<p><strong>12. gainNode.gain.exponentialRampToValueAtTime(0.001, audioCtx.currentTime + 1)<\/strong><br \/>\n<code>exponentialRampToValueAtTime()<\/code>\u65b9\u6cd5\u8868\u793a\u97f3\u91cf\u5728\u67d0\u65f6\u95f4\u6307\u6570\u53d8\u5316\u5230\u67d0\u503c\uff0c\u8fd9\u91cc\u7684<code>exponentialRampToValueAtTime(0.001, audioCtx.currentTime + 1)<\/code>\u5b9e\u9645\u4e0a\u8868\u793a\u7684\u662f\u5728<code>1.00<\/code>\u79d2\u7684\u65f6\u95f4\u5185\uff0c\u97f3\u91cf\u7531\u4e4b\u524d\u7684<code>1<\/code>\u4ee5\u6307\u6570\u66f2\u7ebf\u7684\u901f\u5ea6\u964d\u5230\u6781\u4f4e\u7684<code>0.001<\/code>\u97f3\u91cf\u3002<\/p>\n<p>\u6211\u4eec\u628a10, 12\u884c\u4ee3\u7801\u8054\u7cfb\u8d77\u6765\uff0c\u53ef\u80fd\u5c31\u662f\u8fd9\u6837\u4e00\u4e2a\u66f2\u7ebf\uff08\u81ea\u5df1\u624b\u7ed8\u7684\uff0c\u51d1\u5408\u770b\u5427\uff09\uff1a<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201706\/wave-lome.png\" width=\"288\" height=\"198\" alt=\"\u58f0\u97f3\u66f2\u7ebf\u56fe\" class=\"alignnone\" \/><\/p>\n<p>\u8fd9\u6837\u5904\u7406\uff0c\u58f0\u97f3\u6d88\u5931\u5c31\u6709\u201c\u5ff5\u5ff5\u4e0d\u5fd8\uff0c\u5fc5\u6709\u56de\u54cd\u201d\u7684\u6548\u679c\uff0c\u5c31\u5f88\u6709\u7434\u952e\u6309\u4e0b\u53bb\u58f0\u97f3\u7684\u611f\u89c9\u3002<\/p>\n<p><strong>13. oscillator.stop(audioCtx.currentTime + 1)<\/strong><br \/>\n1\u79d2\u540e\uff0c\u58f0\u97f3\u5173\u95ed\u3002<\/p>\n<p>\u6700\u7ec8\uff0c\u6211\u4eec\u628a\u6e90\u7801\u548c\u6ce8\u91ca\u91cd\u65b0\u6574\u5408\u4e0b\u5c31\u6709\uff1a<\/p>\n<pre>\n<span style=\"color:green;\">\/\/ \u521b\u5efa\u97f3\u9891\u4e0a\u4e0b\u6587<\/span>  \nvar audioCtx = new AudioContext();\n<span style=\"color:green;\">\/\/ \u521b\u5efa\u97f3\u8c03\u63a7\u5236\u5bf9\u8c61<\/span>  \nvar oscillator = audioCtx.createOscillator();\n<span style=\"color:green;\">\/\/ \u521b\u5efa\u97f3\u91cf\u63a7\u5236\u5bf9\u8c61<\/span>  \nvar gainNode = audioCtx.createGain();\n<span style=\"color:green;\">\/\/ \u97f3\u8c03\u97f3\u91cf\u5173\u8054<\/span>  \noscillator.connect(gainNode);\n<span style=\"color:green;\">\/\/ \u97f3\u91cf\u548c\u8bbe\u5907\u5173\u8054<\/span>  \ngainNode.connect(audioCtx.destination);\n<span style=\"color:green;\">\/\/ \u97f3\u8c03\u7c7b\u578b\u6307\u5b9a\u4e3a\u6b63\u5f26\u6ce2<\/span>  \noscillator.type = 'sine';\n<span style=\"color:green;\">\/\/ \u8bbe\u7f6e\u97f3\u8c03\u9891\u7387<\/span>  \noscillator.frequency.value = 196.00;\n<span style=\"color:green;\">\/\/ \u5148\u628a\u5f53\u524d\u97f3\u91cf\u8bbe\u4e3a0<\/span>  \ngainNode.gain.setValueAtTime(0, audioCtx.currentTime);\n<span style=\"color:green;\">\/\/ 0.01\u79d2\u65f6\u95f4\u5185\u97f3\u91cf\u4ece\u521a\u521a\u76840\u53d8\u62101\uff0c\u7ebf\u6027\u53d8\u5316<\/span> \ngainNode.gain.linearRampToValueAtTime(1, audioCtx.currentTime + 0.01);\n<span style=\"color:green;\">\/\/ \u58f0\u97f3\u8d70\u8d77<\/span> \noscillator.start(audioCtx.currentTime);\n<span style=\"color:green;\">\/\/ 1\u79d2\u65f6\u95f4\u5185\u97f3\u91cf\u4ece\u521a\u521a\u76841\u53d8\u62100.001\uff0c\u6307\u6570\u53d8\u5316<\/span> \ngainNode.gain.exponentialRampToValueAtTime(0.001, audioCtx.currentTime + 1);\n<span style=\"color:green;\">\/\/ 1\u79d2\u540e\u505c\u6b62\u58f0\u97f3<\/span> \noscillator.stop(audioCtx.currentTime + 1);\n<\/pre>\n<p>\u8fd9\u4e0b\u5c31\u597d\u7406\u89e3\u591a\u4e86\uff01<\/p>\n<h3>\u56db\u3001\u7ed3\u675f\u8bed<\/h3>\n<p>\u672c\u6587\u5c55\u793a\u7684\u4ea4\u4e92\u97f3\u6548\u4ec5\u4ec5\u662fHTML5 Web Audio API\u4f17\u591a\u7279\u6027\u4e2d\u7684\u51b0\u5c71\u4e00\u89d2\uff0c\u4f46\u5df2\u7ecf\u8db3\u591f\u8ba9\u5e7f\u544a\u6027\u8d28\u7c7b\u7684\u7f51\u9875\u71a0\u71a0\u751f\u8f89\uff0c\u751a\u81f3\u4f20\u7edfweb\u7ad9\u70b9\u5728\u4e00\u4e9b\u7279\u6b8a\u573a\u5408\u4e5f\u662f\u53ef\u4ee5\u5c1d\u8bd5\u4f7f\u7528\u7684\u3002<\/p>\n<p>\u6700\u540e\uff0c\u4ecb\u7ecd\u51e0\u4e2a\u548cweb audio\u76f8\u5173\u7684JS\u5e93\uff0c<a href=\"https:\/\/alemangui.github.io\/pizzicato\/\" target=\"_blank\">Pizzicato.js<\/a>\u3001<a href=\"https:\/\/github.com\/jeromeetienne\/webaudiox\" target=\"_blank\">webaudiox.js<\/a>\u3001<a href=\"https:\/\/github.com\/goldfire\/howler.js\" target=\"_blank\">howler.js<\/a>\u3001<a href=\"https:\/\/github.com\/rserota\/wad\" target=\"_blank\">WAD<\/a>\u3001<a href=\"https:\/\/tonejs.github.io\/\" target=\"_blank\">Tone.js<\/a>\uff0c\u9002\u5408\u590d\u6742\u97f3\u9891\u5904\u7406\u573a\u666f\u3002<\/p>\n<p>HTML5 Web Audio API Chrome\uff0cSafari\u4ee5\u53caFirefox\u6d4f\u89c8\u5668\u90fd\u662f\u652f\u6301\u7684\uff0c\u517c\u5bb9\u6027\u8fd8\u662f\u4e0d\u9519\u7684\u3002<\/p>\n<p>\u53c2\u8003\u6587\u7ae0\uff1a<\/p>\n<ul>\n<li><a href=\"https:\/\/developer.mozilla.org\/zh-CN\/docs\/Web\/API\/AudioContext\" target=\"_blank\" rel=\"nofollow\">MDN &#8211; AudioContext<\/a><\/li>\n<li><a href=\"https:\/\/segmentfault.com\/a\/1190000003115198\" target=\"_blank\" rel=\"nofollow\">\u90a3\u4e9b audio api\u7684\u4e8b (\u4e00) AudioContext<\/a><\/li>\n<li><a href=\"https:\/\/css-tricks.com\/introduction-web-audio-api\/\" target=\"_blank\" rel=\"nofollow\">Introduction to Web Audio API<\/a><\/li>\n<\/ul>\n<p>\u611f\u8c22\u9605\u8bfb\uff01<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201611\/14.png\" align=\"absmiddle\"><\/p>\n<p>\u672c\u6587\u4e3a\u539f\u521b\u6587\u7ae0\uff0c\u4f1a\u7ecf\u5e38\u66f4\u65b0\u77e5\u8bc6\u70b9\u4ee5\u53ca\u4fee\u6b63\u4e00\u4e9b\u9519\u8bef\uff0c\u56e0\u6b64\u8f6c\u8f7d\u8bf7\u4fdd\u7559\u539f\u51fa\u5904\uff0c\u65b9\u4fbf\u6eaf\u6e90\uff0c\u907f\u514d\u9648\u65e7\u9519\u8bef\u77e5\u8bc6\u7684\u8bef\u5bfc\uff0c\u540c\u65f6\u6709\u66f4\u597d\u7684\u9605\u8bfb\u4f53\u9a8c\u3002<br \/>\n\u672c\u6587\u5730\u5740\uff1a<a href=\"http:\/\/www.zhangxinxu.com\/wordpress\/?p=6220\">http:\/\/www.zhangxinxu.com\/wordpress\/?p=6220<\/a><\/p>\n<p>\uff08\u672c\u7bc7\u5b8c\uff09<\/p>\n","protected":false},"excerpt":{"rendered":"<p>HTML5 Web Audio API\u53ef\u4ee5\u8ba9\u6211\u4eec\u65e0\u4e2d\u751f\u6709\u521b\u9020\u58f0\u97f3\uff0c\u800c\u4e14\u662f\u5404\u79cd\u97f3\u8c03\u7684\u58f0\u97f3\uff0c\u6362\u53e5\u8bdd\u8bf4\uff0c\u6211\u4eec\u901a\u8fc7JavaScript\u5c31\u4f1a\u521b\u5efa\u4e00\u4e2a\u5b8c\u6574\u7684\u97f3\u4e50\u51fa\u6765\uff0c\u8fd9\u53ef\u80fd\u548c\u6211\u4eec\u4ee5\u524d\u7684\u8ba4\u77e5\u6709\u4e9b\u4e0d\u4e00\u6837\uff0c\u4f8b\u5982\u70b9\u51fb\u6309\u94ae\u51fa\u73b0\u4e00\u4e2a\u70b9\u51fb\u7684\u97f3\u6548\uff0c\u4f20\u7edf\u601d\u7ef4\u53ef\u80fd\u662f\u9700\u8981JS\u89e6\u53d1\u4e00\u4e2a<code>&lt;audio&gt;<\/code>\u97f3\u9891\u6587\u4ef6\u7684\u64ad\u653e\uff0c\u5b9e\u9645\u4e0a\uff0c\u5e76\u4e0d\u9700\u8981\u4efb\u4f55\u989d\u5916\u7684\u8d44\u6e90\uff0c\u5341\u51e0\u884cJS\u4ee3\u7801\u5c31\u53ef\u4ee5\u641e\u5b9a\uff0c\u800c\u8fd9\u5c31\u662f\u672c\u6587\u8981\u4ecb\u7ecd\u7684\u5185\u5bb9\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1284],"tags":[215,489,1137,1140,1139,1138,52,1141],"_links":{"self":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/posts\/6220"}],"collection":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/comments?post=6220"}],"version-history":[{"count":0,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/posts\/6220\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/media?parent=6220"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/categories?post=6220"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/tags?post=6220"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}