{"id":5290,"date":"2016-03-07T00:22:37","date_gmt":"2016-03-06T16:22:37","guid":{"rendered":"http:\/\/www.zhangxinxu.com\/wordpress\/?p=5290"},"modified":"2016-03-07T00:25:59","modified_gmt":"2016-03-06T16:25:59","slug":"better-black-mask-guide-overlay-method","status":"publish","type":"post","link":"https:\/\/www.zhangxinxu.com\/wordpress\/2016\/03\/better-black-mask-guide-overlay-method\/","title":{"rendered":"\u817e\u8baf\u5fae\u4e91\u9ed1\u8272\u906e\u7f69\u5f15\u5bfc\u8499\u7248\u66f4\u597d\u7684CSS\u5b9e\u73b0\u65b9\u5f0f"},"content":{"rendered":"

by zhangxinxu<\/a> from http:\/\/www.zhangxinxu.com<\/a>
\n\u672c\u6587\u5730\u5740\uff1ahttp:\/\/www.zhangxinxu.com\/wordpress\/?p=5290<\/a><\/p>\n

\u4e00\u3001\u5fae\u4e91\u7684\u5b9e\u73b0<\/h3>\n

\u7f51\u7ad9\u6709\u4e00\u4e9b\u6539\u52a8\u7684\u65f6\u5019\uff0c\u4e3a\u4e86\u8ba9\u7528\u6237\u719f\u77e5\u65b0\u7684\u64cd\u4f5c\u4f4d\u7f6e\uff0c\u5f80\u5f80\u4f1a\u589e\u52a0\u4e00\u4e2a\u5f15\u5bfc\uff0c\u5e38\u89c1\u7684\u65b9\u5f0f\u5c31\u662f\u4f7f\u7528\u4e00\u4e2a\u9ed1\u8272\u7684\u534a\u900f\u660e\u8499\u7248\uff0c\u7136\u540e\u9700\u8981\u5173\u6ce8\u7684\u533a\u57df\u662f\u9542\u7a7a\u7684\u3002<\/p>\n

\u7136\u540e\u4e0a\u5468\u4e94\u6211\u53bb\u5fae\u4e91<\/a>\u8f6c\u60a0\u7684\u65f6\u5019\uff0c\u4e5f\u770b\u5230\u4e86\u5f15\u5bfc\u5c42\uff0c\u4e8e\u662f\u804c\u4e1a\u75c5\u53c8\u72af\u4e86\uff0c\u53bb\u5b66\u4e60\u4e0b\u522b\u4eba\u662f\u600e\u4e48\u5b9e\u73b0\u7684\u3002\u4e0b\u9762\u662f\u89c2\u6d4b\u7684\u7ed3\u679c\uff1a<\/p>\n

\u4e3a\u4e86\u5b9e\u73b0\u9542\u7a7a\u8499\u5c42\u6548\u679c\uff0c\u4f5c\u8005\u53d1\u6325\u4e86\u5c0f\u65f6\u5019\u62fc\u79ef\u6728\u7684\u624d\u80fd\uff0c\u4f7f\u7528\u4e24\u5c42HTML\u7ed3\u6784\uff0c\u5185\u5c42\u4f7f\u75285\u5757\u72ec\u7acb\u533a\u57df\u62fc\u63a5\u5f62\u6210\uff0c\u81f3\u4e8e\u4e2d\u95f4\u9542\u7a7a\u7684\u533a\u57df\u7684\u9634\u5f71\u5219\u662f\u4f7f\u7528\u7684\u56fe\u7247\u5b9e\u73b0\u7684\u3002<\/p>\n

\"\u5fae\u4e91\u7684\u5b9e\u73b0\"<\/p>\n

\"\u5fae\u4e91\u7684\u5b9e\u73b0\"<\/p>\n

\u867d\u7136\u6700\u7ec8\u7684\u6548\u679c\u6ee1\u8db3\u4e86\u4ea7\u54c1\u7684\u9700\u6c42\uff0c\u5bf9\u4e8e\u7528\u6237\u800c\u8a00\uff0c\u76ee\u7684\u5df2\u7ecf\u8fbe\u5230\u3002\u4f46\u662f\uff0c\u4ece\u4ee3\u7801\u8d28\u91cf\u5c42\u9762\u3001\u6f5c\u5728\u7684\u4f53\u9a8c\u63d0\u5347\u53ef\u80fd\u6027\u3001\u4f7f\u7528\u573a\u666f\u5e7f\u5ea6\u4e0a\u6765\u8bb2\uff0c\u8fd8\u662f\u5f31\u4e86\u5f88\u591a\u7684\u3002<\/p>\n

\u4e3e\u4f8b\u6765\u8bf4\uff0c\u5982\u679c\u6211\u4eec\u67d0\u4e2a\u63d0\u793a\u533a\u57df\u9762\u79ef\u5f88\u5927\uff0c\u90a3\u4e2d\u95f4\u7684\u90a3\u4e2a\u9542\u7a7a\u533a\u57df\u5c3a\u5bf8\u662f\u4e0d\u662f\u8981\u53d8\uff0c\u90a3\u540e\u9762\u7684\u80cc\u666f\u56fe\u7247\u600e\u4e48\u529e\uff1f\u641e\u65b0\u56fe\uff0c\u6709\u4eba\u770b\u5230\u4e86\u4f7f\u7528\u4e86background-size:cover<\/code>, \u90a3IE7,IE8\u600e\u4e48\u529e\uff1f\u54e6\uff0c\u53ef\u80fd\u5fae\u4e91\u4e0d\u9700\u8981\u7ba1IE7, IE8.<\/p>\n

\u5982\u679c\u4e0d\u9700\u8981\u7ba1IE7, IE8\uff0c\u90a3\u8fd9\u91cc\u7684\u5b9e\u73b0\u5c31\u663e\u5f97\u66f4\u52a0\u5c0f\u767d\u4e86\u3002\u6211\u4eec\u5b9e\u9645\u4e0a\u53ea\u9700\u8981\u4e00\u5c42\u6807\u7b7e\uff0c\u4e00\u5c42\u7a7a\u6807\u7b7e\u5c31\u53ef\u4ee5\u5b9e\u73b0\u6211\u4eec\u7684\u6548\u679c\uff0c\u4e14\u4e0d\u9700\u8981\u56fe\u7247\u3002<\/p>\n

\u4e8c\u3001\u6211\u7684\u5b9e\u73b0<\/h3>\n

\u4e3b\u8981\u5728\u4e8e\u601d\u7ef4\u65b9\u5f0f\u7684\u53d8\u5316\u3002\u62fc\u79ef\u6728\u8fd9\u79cd\u60f3\u6cd5\u5927\u5bb6\u90fd\u6bd4\u8f83\u5bb9\u6613\u60f3\u5230\uff0c\u7b26\u5408\u65e5\u5e38\u8ba4\u77e5\uff0c\u4f46\u662f\uff0c\u4f46\u4ee3\u7801\u5c42\u9762\uff0c\u6211\u4eec\u53ef\u4ee5\u8fdb\u884c\u601d\u7ef4\u8f6c\u6362\uff0c\u53d1\u6563\u601d\u8003\uff0c\u504c\u5927\u7684\u534a\u900f\u660e\u906e\u7f69\u5c42\uff0c\u6211\u4eec\u4e0d\u8981\u8001\u60f3\u7740\u80cc\u666f\u8272\u5757\u80cc\u666f\u8272\u5757\uff0c\u53ef\u4ee5\u7a81\u7834\u5e38\u89c4\u601d\u7ef4\uff0c\u628a\u5b83\u8ba4\u4e3a\u662f\u8fb9\u6846\uff0c\u4e00\u4e2a\u5f88\u5927\u5f88\u5927\u7684\u8fb9\u6846\uff08\u6211\u4eec\u5e73\u65f6\u4f7f\u7528border\u90fd\u662f1<\/code>\u50cf\u7d20\u5de8\u591a\uff09\uff0c\u8fd9\u6837\uff0c\u6211\u4eec\u81ea\u7136\u5c31\u6709\u4e86\u9542\u7a7a\u6548\u679c\u3002<\/p>\n

\u5982\u4e0b\u56fe\u793a\u610f\uff1a
\n\"border\u5b9e\u73b0\u8499\u7248\"<\/p>\n

\u4f46\u662f\uff0c\u76ee\u524d\u6211\u4eec\u4e2d\u95f4\u7684\u9542\u7a7a\u533a\u57df\u65b9\u7684\uff0c\u6709\u6ca1\u6709\u4ec0\u4e48\u529e\u6cd5\u53d8\u6210\u5706\u7684\u5462\uff1f
\n\u81ea\u7136\u6709\uff0c\u65b9\u6cd51<\/strong>\u662f\u5143\u7d20\u8bbe\u7f6e\u8d85\u5927\u5706\u89d2\uff0c\u4f46\u662f\uff0c\u6b64\u65f6\u4e3a\u4e86\u8fb9\u6846\u4f9d\u7136\u586b\u6ee1\u6574\u4e2a\u5c4f\u5e55\uff0cborder<\/code>\u8fb9\u6846\u5c3a\u5bf8\u8981\u5927\u5927\u589e\u5927\uff0c\u4f46\u662f\uff0c\u4e3a\u4e86\u4e0d\u5f71\u54cd\u9875\u9762\u7684\u6eda\u52a8\u6761\uff0c\u6211\u4eec\u5fc5\u987b\u518d\u5d4c\u5957\u4e00\u5c42\u6807\u7b7e\uff0c\u5c31\u663e\u5f97\u5570\u55e6\u4e86\uff1b
\n\u65b9\u6cd52<\/strong>\u5219\u662f\u65b9\u6cd51\u67d0\u4e9b\u65b9\u9762\u7684\u9006\u5411\u601d\u7ef4\u5904\u7406\uff0c\u5c31\u662f\u628a\u5f53\u524d\u5143\u7d20\u4f5c\u4e3a\u5916\u5c42\u9650\u5236\u6807\u7b7e\uff0c\u91cc\u9762\u91cd\u65b0\u751f\u6210\u4e00\u4e2a\u5927\u5c3a\u5bf8\u4f2a\u5143\u7d20\uff0c\u5b9e\u73b0\u81ea\u9002\u5e94\u5c3a\u5bf8\u7684\u5706\u89d2\u6548\u679c\uff0c\u8fd9\u4e2a\u597d\uff0cHTML\u5e72\u51c0\u4e0d\u5570\u55e6\uff0cCSS\u4e00\u6b65\u5230\u4f4d\uff08\u4ee3\u7801\u5982\u4e0b\u793a\u610f\uff09\uff1b<\/p>\n

\n
.cover::before {\n    content: '';\n    width: 100%; height:100%;\n    border-radius: 50%;\n    border: 400px solid #000;\n    position: absolute;\n    left: -400px; top: -400px;\n    \/* \u81ea\u5df1\u778e\u586b\u7684\u53c2\u6570\uff0c\u793a\u610f *\/<\/span>\n    box-shadow: inset 0 0 5px 2px rgba(0,0,0,.75);\n}<\/pre>\n<\/div>\n
\u5927\u5bb6\u53ef\u4ee5\u770b\u5230\uff0c\u4e0a\u9762\u7684\u4f2a\u5143\u7d20\u7684\u5404\u4e2a\u53c2\u6570\u90fd\u662f\u56fa\u5b9a\u53c2\u6570\u503c\uff0c\u4e0e\u5916\u90e8\u5143\u7d20\u7684\u5c3a\u5bf8\u4ec0\u4e48\u7684\u6ca1\u6709\u4efb\u4f55\u5173\u7cfb\uff0c\u53ea\u8981\u5916\u90e8\u5143\u7d20\u5c3a\u5bf8\u4e0d\u8d85\u8fc7400\uff0c\u91cc\u9762\u6c38\u8fdc\u4f1a\u6709\u4e00\u4e2a\u6b63\u692d\u5706\u7684\u5185\u9634\u5f71\u7684\u9542\u7a7a\u56fe\u5f62\uff08\u56e0\u4e3a\u8d85\u51fa\u90e8\u5206\u4f1a\u88ab.cover<\/code>\u9690\u85cf\uff09\uff0c\u8981\u7406\u89e3\u5706\u89d2\u548c\u6b63\u692d\u5706\u7684\u5173\u7cfb\uff0c\u53ef\u4ee5\u53c2\u8003\u6211\u4e4b\u524d\u7684\u6587\u7ae0\uff1a\u201c\u79cb\u6708\u4f55\u65f6\u4e86\uff0cCSS3 border-radius\u77e5\u591a\u5c11\uff1f<\/a>\u201d\u3002<\/p>\n
\u773c\u89c1\u4e3a\u5b9e\uff0c\u8033\u542c\u4e3a\u865a\uff0c\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a\u4e00\u5c42\u6807\u7b7e\u5b9e\u73b0\u7f51\u7ad9\u5f15\u5bfc\u9542\u7a7a\u8499\u7248\u529f\u80fddemo<\/a> \uff08\u70b9\u51fb\u9ed1\u8272\u8499\u5c42\u4f1a\u6709\u5f15\u5bfc\u5207\u6362\u6548\u679c\uff09<\/p>\n
demo\u8fd9\u4e2a\u9542\u7a7a\u8499\u5c42\u6240\u4f7f\u7528\u7684HTML\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
\n
<div class=\"cover\"><\/div><\/pre>\n<\/div>\n
\u6ca1\u9519\uff0c\u5c31\u8fd9\u4e48\u7b80\u5355\uff0c\u6ca1\u4ec0\u4e48\u5d4c\u5957\uff0c\u6ca1\u6709\u4ec0\u4e48\u4e94\u4e2a\u5143\u7d20\u53d8\u5f62\u91d1\u521a\u5408\u4f53\uff0c\u6ca1\u6709\u4f7f\u7528\u56fe\u7247\u3002<\/p>\n
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\u800c\u4e14\uff0c\u5927\u5bb6\u5982\u679c\u70b9\u51fb\u8499\u7248\uff0c\u4f1a\u53d1\u73b0\uff0c\u9542\u7a7a\u7684\u533a\u57df\u5927\u5c0f\u6bcf\u6b21\u90fd\u662f\u4e0d\u4e00\u6837\u7684\uff0c\u6709\u5927\u6709\u5c0f\uff0c\u6709\u9ad8\u6709\u7626\uff0c\u800c\u5fae\u4e91\u7684\u90a3\u4e2a\u5b9e\u73b0\u65b9\u6cd5\u8981\u6ee1\u8db3\u6b64\u9700\u6c42\u5c31\u68d8\u624b\uff1b\u800c\u4e14\uff0c\u5927\u5bb6\u53d1\u73b0\u6ca1\uff0c\u8fd9\u4e9b\u5c3a\u5bf8\u4f4d\u7f6e\u7684\u53d8\u5316\u90fd\u662f\u52a8\u753b\u6765\u52a8\u753b\u53bb\u7684\uff0c\u4e0d\u662f\u55d9\u55d9\u55d9\u8fd9\u79cd\u751f\u786c\u7684\u6548\u679c\uff0c\u66f4soft, \u5bf9\u7528\u6237\u89c6\u89c9\u5f15\u5bfc\u6548\u679c\u66f4\u597d\uff0c\u4f60\u770b\uff0c\u6211\u4ece\u8fd9\u91cc\u5230\u8fd9\u91cc\u4e86\uff0c\u4e3a\u4ec0\u4e48\u53ef\u4ee5\u5b9e\u73b0\u52a8\u753b\u6548\u679c\u5462\uff0c\u56e0\u4e3a\u6211\u4eec\u7684\u9542\u7a7a\u548c\u5185\u9634\u5f71\u90fd\u662fCSS\u5b9e\u73b0\u7684\uff0c\u800c\u5fae\u4e91\u7684\u56fe\u7247\u65b9\u6cd5\uff0c\u663e\u7136\u662f\u65e0\u6cd5\u6709\u52a8\u753b\u7684\u3002<\/p>\n
\"\u5f15\u5bfc\u8fc7\u6e21\u52a8\u753b\u6548\u679c\"<\/p>\n
JS\u4ee3\u7801\u8f85\u52a9<\/strong>
\n\u5f53\u7136\uff0c\u6211\u7684\u5b9e\u73b0\u4e5f\u79bb\u4e0d\u5f00JS\u7684\u8f85\u52a9\uff0cJS\u7684\u5de5\u4f5c\u5f88\u7b80\u5355\uff0c\u8ba9\u8499\u5c42\u7684width<\/code>\/height<\/code>\u4ee5\u53caborder<\/code>\u5927\u5c0f\u548c\u9700\u8981\u5f15\u5bfc\u7684\u5143\u7d20\u76f8\u5173\u8054\u3002<\/p>\n
\u6211\u7279\u610f\u6574\u4e86\u4e2a\u53ef\u4ee5\u516c\u7528\u7684\u65b9\u6cd5coverGuide<\/code>\uff08\u547d\u540d\u4e0d\u559c\u6b22\u81ea\u5df1\u968f\u4fbf\u6539\uff09\uff1a<\/p>\n
\n
var coverGuide = function(cover, target) {\n    var body = document.body, doc = document.documentElement;\n    if (cover && target) {\n        \/\/ target size(width\/height)<\/span>\n        var targetWidth = target.clientWidth,\n            targetHeight = target.clientHeight;\n\n        \/\/ page size<\/span>\n        var pageHeight = doc.scrollHeight,\n            pageWidth = doc.scrollWidth;\n        \n        \/\/ offset of target    <\/span>\n        var offsetTop = target.getBoundingClientRect().top + (body.scrollTop || doc.scrollTop),\n            offsetLeft = target.getBoundingClientRect().left + (body.scrollLeft || doc.scrollLeft);\n        \n        \/\/ set size and border-width<\/span>\n        cover.style.width = targetWidth + 'px';\n        cover.style.height = targetHeight + 'px';    \n        cover.style.borderWidth = \n            offsetTop + 'px ' + \n            (pageWidth - targetWidth - offsetLeft) + 'px ' +\n            (pageHeight - targetHeight - offsetTop) + 'px ' + \n            offsetLeft + 'px';\n        \n        cover.style.display = 'block';\n            \n        \/\/ resize<\/span>\n        if (!cover.isResizeBind) {\n            if (window.addEventListener) {\n                window.addEventListener('resize', function() {\n                    coverGuide(cover, target);\n                });    \n                cover.isResizeBind = true;\n            } else if (window.attachEvent) {\n                window.attachEvent('onresize', function() {\n                    coverGuide(cover, target);\n                });\n                cover.isResizeBind = true;\n                \n                \/\/ IE7, IE8 box-shadow hack<\/span>\n                cover.innerHTML = '<img src=\"guide-shadow.png\">';\n            }\n        }\n    }\n};<\/pre>\n<\/div>\n
\u8fd9\u91cc\u7684coverGuide<\/code>\u65b9\u6cd5\u4f7f\u7528\u539f\u751fJS\u5b9e\u73b0\uff0cIE6+\u6d4f\u89c8\u5668\u90fd\u662f\u517c\u5bb9\u7684\uff0c\u4e0d\u4f9d\u8d56JS\u5e93\uff0c\u5927\u5bb6\u53ef\u4ee5\u968f\u610f\u4f7f\u7528\u3002\u5f53\u7136\uff0c\u5199\u5f97\u5306\u5fd9\uff0c\u6ca1\u6709\u4e25\u683c\u9a8c\u8bc1\uff0c\u53ef\u80fd\u6709bug\uff0c\u5927\u5bb6\u53ef\u4ee5\u7a0d\u5fae\u7559\u70b9\u5fc3\u3002<\/p>\n
\u4f7f\u7528\u975e\u5e38\u7b80\u5355\uff0c\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n
\n
coverGuide(cover, target);<\/pre>\n<\/div>\n
\u5176\u4e2dcover<\/code>\u5c31\u662f.cover<\/code>\u8fd9\u4e2a\u5355\u72ec\u7684\u8499\u7248\u5143\u7d20\uff0ctarget<\/code>\u5219\u662f\u6211\u4eec\u9700\u8981\u6307\u5f15\u7684\u5143\u7d20\uff0c\u6309\u94ae\u554a\uff0c\u5bfc\u822a\u4ec0\u4e48\u7684\u3002\u7136\u540e\uff0c\u6211\u4eec\u7684\u9542\u7a7a\u533a\u57df\u81ea\u52a8\u5b9a\u4f4d\u5230target<\/code>\u7684\u4f4d\u7f6e\uff0c\u5927\u5c0f\u4e5f\u662ftarget<\/code>\u5143\u7d20\u7684\u5927\u5c0f\u3002\u8d85\u7701\u5fc3\u3002<\/p>\n
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IE7,IE8\u600e\u4e48\u529e<\/strong>
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