{"id":3855,"date":"2013-12-30T20:40:24","date_gmt":"2013-12-30T12:40:24","guid":{"rendered":"http:\/\/www.zhangxinxu.com\/wordpress\/?p=3855"},"modified":"2016-12-18T21:54:02","modified_gmt":"2016-12-18T13:54:02","slug":"javascript-js-%e5%85%83%e7%b4%a0-%e6%8a%9b%e7%89%a9%e7%ba%bf-%e8%bf%90%e5%8a%a8-%e5%8a%a8%e7%94%bb","status":"publish","type":"post","link":"https:\/\/www.zhangxinxu.com\/wordpress\/2013\/12\/javascript-js-%e5%85%83%e7%b4%a0-%e6%8a%9b%e7%89%a9%e7%ba%bf-%e8%bf%90%e5%8a%a8-%e5%8a%a8%e7%94%bb\/","title":{"rendered":"\u5c0f\u6298\u817e\uff1aJavaScript\u4e0e\u5143\u7d20\u95f4\u7684\u629b\u7269\u7ebf\u8f68\u8ff9\u8fd0\u52a8"},"content":{"rendered":"

by zhangxinxu<\/a> from http:\/\/www.zhangxinxu.com<\/a>
\n\u672c\u6587\u5730\u5740\uff1ahttp:\/\/www.zhangxinxu.com\/wordpress\/?p=3855<\/a><\/p>\n

\u4e00\u3001\u4e00\u5242\u9884\u9632\u9488<\/h3>\n

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SO, \u6709\u5fc5\u8981\u5728\u8fd9\u91cc\u6253\u4e2a\u9884\u9632\u9488\uff0c\u672c\u6587\u5b9e\u9645\u4e0a\u6ca1\u4ec0\u4e48\u6280\u672f\u517b\u6599\uff0c\u5c31\u662f\u6628\u665a\u56e0\u5b9e\u9645\u5de5\u4f5c\u9700\u8981\u6298\u817e\u7684\u4e2a\u4e1c\u897f\uff0c\u629b\u7269\u7ebf\u8f68\u8ff9\u52a8\u753b\u3002\u5982\u679c\u4f60\u6025\u7740\u8ddf\u5973\u795e\u641e\u6627\uff0c\u4e0b\u9762\u7684\u53ef\u4ee5\u76f4\u63a5pass~~
\n\"\u6ca1\u517b\u6599<\/p>\n

\u4e0d\u8fc7\u8fd9\u91cc\u6709\u4e2a\u6709\u517b\u6599\u7684\u4e1c\u897f\uff0c\u8981\u8ddf\u5927\u5bb6\u5206\u4eab\u4e0b\uff0c\u5f53\u5f53\u5f53\u5f53\uff0c\u5c31\u662f\u4e0b\u9762\u8fd9\u4e2a\uff1a
\n\"\u516c\u53f8\u798f\u5229-\u7315\u7334\u6843\"<\/p>\n

\u6b63\u5b97\u66f2\u6c5f\u7315\u7334\u6843\u3002\u516c\u53f8\u798f\u5229\uff0c\u5185\u90e8\u4ef7\uff0c37\u5143\u4e00\u7bb1<\/strong>\uff0c\u5bf9\uff01\u4f60\u6ca1\u770b\u9519\uff01\u5c31\u662f37\u5143\uff01\u8d27\u771f\u4ef7\u5b9e37\u5143\uff01\u8db3\u8db3\u670927\u4e2a\u7315\u7334\u6843\uff01\u5404\u4e2a\u591a\u6c41\u751c\u7f8e\uff0c\u8bf1\u4eba\u65e0\u6bd4\uff01\u6211\u5468\u56f4\u540c\u4e8b\u51e0\u4e4e\u4eba\u4eba\u641e\u4e86\u4e00\u7bb1\uff01\u662f\u4e0d\u662f\u8d85\u5212\u7b97\u54c8\uff01\u662f\u4e0d\u662f\u5f88\u5fc3\u52a8\u554a\uff01\u662f\u4e0d\u662f\u5f88\u7fa1\u6155\u54c8\uff01\u6211\u5382\u7c7b\u4f3c\u6709\u517b\u6599\u7684\u798f\u5229\u8fd8\u6709\u5f88\u591a\u54e6\uff01\u5fc3\u52a8\u4e0d\u884c\u52a8\uff0c\u628a\u59b9\u6c38\u88ab\u52a8\u3002\u5077\u5077\u544a\u8bc9\u4f60\u54e6\uff0c\u6211\u4eec\u8fd9\u8fb9\u8fd8\u5dee\u4e00\u4e2a\u524d\u7aef\uff0c\u6211\u4eecISUX\u4e0a\u6d77<\/strong>\u53ef\u662f\u6211\u5382\u975e\u5e38\u4f18\u79c0\u7684\u56e2\u961f\u54e6\uff0c\u8fd8\u4e0d\u7b80\u5386\u901f\u901f\u98de\u6765 – zhangxinxu@zhangxinxu.com . \u4e0d\u8981\u62c5\u5fc3\uff0c\u4f60\u7b80\u5386\u518dlow\u6211\u4e5f\u4f1a\u8010\u5fc3\u56de\u590d\u4f60\u7684\uff0c\u7edd\u5bf9\u4e0d\u4f1a\u77f3\u6c89\u5927\u6d77\uff0c\u91cd\u590d\u8fc7\u53bb\u4f60\u7684\u4e0d\u5f00\u5fc3\u7ecf\u5386\u7684\u54c8\uff01<\/p>\n

\u4e8c\u3001\u52a8\u753b\u4e0e\u89c6\u89c9\u5f15\u5bfc<\/h3>\n

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\u4e8e\u662f\uff0c\u4e0b\u73ed\u540e\u5c31\u62bd\u65f6\u95f4\u6298\u817e\u54c8~~<\/p>\n

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\u4e09\u3001\u6570\u5b66\u51fd\u6570\u4e0e\u52a8\u753b\u8f68\u8ff9<\/h3>\n

\/\/zxx: \u7fcc\u65e5\u2026\u2026<\/span><\/p>\n

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\u54c8\uff0c\u8bb2\u6b63\u7ecf\u7684\u3002<\/p>\n

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\n
y = a*x*x + b*x + c<\/pre>\n<\/div>\n
(x, y)<\/code>\u5c31\u662f\u70b9\u5750\u6807\uff0c\u5728\u7f51\u9875\u4e0a\u53ef\u4ee5\u7406\u89e3\u4e3a\u76f8\u5bf9\u4e8e\u9875\u9762\u5de6\u4e0a\u89d2\u7684\u504f\u79fb\u50cf\u7d20\u5927\u5c0f\u3002<\/p>\n
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\u56db\u3001\u629b\u7269\u7ebf\u51fd\u6570\u6c42\u89e3<\/h3>\n
\/\/zxx: \u5982\u679c\u672c\u6bb5\u5185\u5bb9\u52fe\u8d77\u4f60\u8fc7\u53bb\u90a3\u6bb5\u60e8\u7edd\u4eba\u5bf0\u7684\u56de\u5fc6\uff0c\u6211\u8fd9\u91cc\u5148\u8bf4\u58f0\u62b1\u6b49\uff01 – \u641e\u54a9\u7eb3\u585e~<\/span><\/p>\n
\u73b0\u5728\uff0c\u6211\u4eec\u7684\u4efb\u52a1\u53d8\u6210\u4e86\u6c42\u89e3\uff1aa<\/code>, b<\/code>, c<\/code>\u4e09\u4e2a\u53c2\u6570\u3002<\/p>\n
3<\/code>\u4e2a\u53c2\u6570\u9700\u89813<\/code>\u4e2a\u6761\u4ef6\u624d\u80fd\u5b8c\u5168\u6c42\u89e3\u3002<\/p>\n
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\u4e8e\u662f\uff0c\u6211\u4eec\u4efb\u52a1\u5c31\u53d8\u6210\u4e86\uff0c\u5df2\u77e5\u53c2\u6570a<\/code>\uff0c\u4ee5\u53ca\u4e24\u4e2a\u70b9\u7684\u5750\u6807\uff0c\u6c42\u8be5\u629b\u7269\u7ebf\u51fd\u6570\u3002<\/p>\n
\u54c8\uff0c\u4e8b\u60c5\u5c31\u7b80\u5355\u591a\u4e86\u3002<\/p>\n
\n
y = a*x*x + b*x + c\n\u2193\ny1 = a * x1*x1 + b*x1 + c;\ny2 = a * x2*x2 + b*x2 + c;\n\u2193\na\u5df2\u77e5\uff0c\u6c42b, c\n<\/pre>\n<\/div>\n
\u4e3a\u4e86\u7b80\u5316\u6211\u4eec\u7684\u8ba1\u7b97\u6c42\u89e3\uff0c\u4ee5\u53ca\u4e0e\u6211\u4eec\u9ad8\u4e2d\u65f6\u5019\u7684\u51fd\u6570\u5750\u6807\u5339\u914d\uff0c\u6211\u4eec\u53ef\u4ee5\u4ee5\u79fb\u52a8\u5143\u7d20\u7684\u521d\u59cb\u4f4d\u7f6e\u4f5c\u4e3a\u5750\u6807\u8f74\u7684\u4e2d\u5fc3\uff08\u7f51\u9875\u9ed8\u8ba4\u7684\u5750\u6807\u7cfb\u5de6\u4e0a\u89d2\u662f\u4e2d\u5fc3\uff0cx<\/code>\u8f74\u5411\u53f3\uff0cy<\/code>\u8f74\u5411\u4e0b\uff0c\u4e0e\u9ad8\u4e2d\u7684\u5750\u6807\u8f74\u4e0d\u4e00\u6837\uff09\u3002\u5982\u4e0b\u94fe\u63a5\u5bf9\u5e94demo\u6240\u793a\u3002<\/p>\n
\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a\u5143\u7d20\u629b\u7269\u7ebf\u8fd0\u52a8demo<\/a><\/p>\n
demo\u9875\u9762\u4e2d\uff0c\u5706\u5f62\u7684\u5c0f\u7403\u7403\u5c31\u662f\u8981\u8fd0\u52a8\u7684\u5143\u7d20\uff1b\u692d\u5706\u7684\u5927\u4fbf\u6c60\u5c31\u662f\u5c0f\u7403\u7403\u8fd0\u52a8\u7684\u76ee\u7684\u5730\uff0c\u5176\u9ed8\u8ba4\u5f00\u59cb\u7684\u5750\u6807\u5982\u4e0b\u6240\u793a\uff1a
\n\"\u7b26\u5408\u9ad8\u4e2d\u6570\u5b66\u7684\u5750\u6807\u7cfb\"<\/p>\n
\u4e5f\u5c31\u662f\uff0c\u6211\u4eec\u9650\u5b9a\u4e86\u629b\u7269\u7ebf\u7ecf\u8fc7\u4e2d\u5fc3\u70b9(0, 0)<\/code>, \u4ee3\u5165y1 = a * x1*x1 + b*x1 + c<\/code>\u53ef\u4ee5\u5f97\u5230c = 0<\/code>, \u4e8e\u662fb = (y2+ a*x2*x2) \/ x2<\/code>, \u5e26\u5165\u5927\u4fbf\u6c60\u5143\u7d20\u7684\u5750\u6807\uff0c\u5c31\u53ef\u4ee5\u8ba1\u7b97\u51fab<\/code>\u7684\u5927\u5c0f\uff0c\u4e8e\u662f\uff0c\u629b\u7269\u7ebf\u51fd\u6570\u5c31\u51fa\u6765\u4e86\u3002<\/p>\n
\u6ce8\u610f\uff0c\u8fd9\u91cc\u201c\u5927\u4fbf\u6c60\u5143\u7d20\u7684\u5750\u6807\u201d\u662f\u76f8\u5bf9\u4e8e\u5c0f\u7403\u7403\u7684\u76f8\u5bf9\u5750\u6807\uff0c\u800c\u4e0d\u662f\u9875\u9762\u5de6\u4e0a\u89d2\u3002<\/p>\n
\u6709\u4e86\u629b\u7269\u7ebf\u51fd\u6570\uff0c\u6211\u4eec\u5c31\u6709\u4e86\u5c0f\u7403\u7403\u8fd0\u52a8\u7684\u8f68\u8ff9\u4e86\u3002<\/p>\n
\u4e94\u3001demo\u6f14\u793a\u53ca\u8bf4\u660e<\/h3>\n
demo\u6f14\u793a\u9875\u9762\u5c31\u662f\u4e0a\u9762\u63d0\u524d\u66dd\u5149\u7684\u94fe\u63a5\u5730\u5740<\/a>\u5566\uff01<\/p>\n
1. \u70b9\u51fb\u9875\u9762\u7684\u4efb\u610f\u4f4d\u7f6e\uff0c\u90fd\u4f1a\u89e6\u53d1\u5c0f\u7403\u7403\u5954\u5411\u5927\u4fbf\u6c60\u7684\u629b\u7269\u7ebf\u8fd0\u52a8\u3002
\n2. \u62d6\u52a8\u5927\u4fbf\u6c60\u5230\u9875\u9762\u7684\u4efb\u610f\u4f4d\u7f6e\uff0c\u4e5f\u4f1a\u89e6\u53d1\u5c0f\u7403\u7403\u4e49\u65e0\u53cd\u987e\u5954\u5411\u5927\u4fbf\u6c60\u7684\u6548\u679c\u3002<\/p>\n
demo\u9875\u9762\u7684\u8fd9\u4e2a\u629b\u7269\u7ebf\u8fd0\u52a8\u57fa\u672c\u4e0a\u662f\u4e2a\u72ec\u7acb\u7684JS\u65b9\u6cd5\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
\n
var funParabola=function(d,t,g){var i={speed:166.67,curvature:0.001,progress:function(){},complete:function(){}};var p={};g=g||{};for(var v in i){p[v]=g[v]||i[v]}var u={mark:function(){return this},position:function(){return this},move:function(){return this},init:function(){return this}};var e=\"margin\",r=document.createElement(\"div\");if(\"oninput\" in r){[\"\",\"ms\",\"webkit\"].forEach(function(b){var a=b+(b?\"T\":\"t\")+\"ransform\";if(a in r.style){e=a}})}var s=p.curvature,q=0,o=0;var k=true;if(d&&t&&d.nodeType==1&&t.nodeType==1){var n={},j={};var h={},m={};var f={},l={};u.mark=function(){if(k==false){return this}if(typeof f.x==\"undefined\"){this.position()}d.setAttribute(\"data-center\",[f.x,f.y].join());t.setAttribute(\"data-center\",[l.x,l.y].join());return this};u.position=function(){if(k==false){return this}var b=document.documentElement.scrollLeft||document.body.scrollLeft,a=document.documentElement.scrollTop||document.body.scrollTop;if(e==\"margin\"){d.style.marginLeft=d.style.marginTop=\"0px\"}else{d.style[e]=\"translate(0, 0)\"}n=d.getBoundingClientRect();j=t.getBoundingClientRect();h={x:n.left+(n.right-n.left)\/2+b,y:n.top+(n.bottom-n.top)\/2+a};m={x:j.left+(j.right-j.left)\/2+b,y:j.top+(j.bottom-j.top)\/2+a};f={x:0,y:0};l={x:-1*(h.x-m.x),y:-1*(h.y-m.y)};q=(l.y-s*l.x*l.x)\/l.x;return this};u.move=function(){if(k==false){return this}var a=0,b=l.x>0?1:-1;var c=function(){var z=2*s*a+q;a=a+b*Math.sqrt(p.speed\/(z*z+1));if((b==1&&a>l.x)||(b==-1&&a<l.x)){a=l.x}var w=a,A=s*w*w+q*w;d.setAttribute(\"data-center\",[Math.round(w),Math.round(A)].join());if(e==\"margin\"){d.style.marginLeft=w+\"px\";d.style.marginTop=A+\"px\"}else{d.style[e]=\"translate(\"+[w+\"px\",A+\"px\"].join()+\")\"}if(a!==l.x){p.progress(w,A);window.requestAnimationFrame(c)}else{p.complete();k=true}};window.requestAnimationFrame(c);k=false;return this};u.init=function(){this.position().mark().move()}}return u};(function(){var b=0;var c=[\"webkit\",\"moz\"];for(var a=0;a<c.length&&!window.requestAnimationFrame;++a){window.requestAnimationFrame=window[c[a]+\"RequestAnimationFrame\"];window.cancelAnimationFrame=window[c[a]+\"CancelAnimationFrame\"]||window[c[a]+\"CancelRequestAnimationFrame\"]}if(!window.requestAnimationFrame){window.requestAnimationFrame=function(h,e){var d=new Date().getTime();var f=Math.max(0,16.7-(d-b));var g=window.setTimeout(function(){h(d+f)},f);b=d+f;return g}}if(!window.cancelAnimationFrame){window.cancelAnimationFrame=function(d){clearTimeout(d)}}}());<\/pre>\n<\/div>\n
\/\/zxx: \u4e3a\u8282\u7ea6\u6587\u7ae0\u7bc7\u5e45\uff0c\u8fd9\u91cc\u653e\u7684\u662f\u538b\u7f29\u540e\u7684\u4ee3\u7801\u3002\u5982\u679c\u60a8\u5bf9\u5b9e\u73b0\u611f\u5174\u8da3\uff0c\u53ef\u4ee5demo\u9875\u9762\u53f3\u952e\u7684\u6e90\u4ee3\u7801\u662f\u975e\u538b\u7f29\u7248\u672c\uff0c\u542b\u6709\u975e\u5e38\u591a\u7684\u6ce8\u91ca\u3002\u6216\u8005\u4f7f\u7528\u8fd9\u4e2aJS\u6587\u4ef6\uff1aparabola.js<\/a><\/p><\/blockquote>\n
\u8be5\u629b\u7269\u7ebf\u65b9\u6cd5\u540d\u4e3afunParabola<\/code>\uff0c\u60a8\u53ef\u4ee5\u6839\u636e\u81ea\u5df1\u7684\u559c\u597d\u4fee\u6539\uff0c\u53c2\u6570\u4ee5\u53ca\u57fa\u672c\u4f7f\u7528\u5982\u4e0b\uff1a<\/p>\n
\n
var myParabola = funParabola(element, target, options);<\/pre>\n<\/div>\n
\u5173\u4e8emyParabola:<\/strong>
\n\u76f4\u63a5\u6267\u884cfunParabola<\/code>\u65b9\u6cd5\u662f\u4e0d\u4f1a\u4ea7\u751f\u8fd0\u52a8\u7684\u3002\u56e0\u4e3a\uff0c\u5b9e\u9645\u4e0afunParabola<\/code>\u6267\u884c\u8fd4\u56de\u7684\u662f\u4e00\u4e2a\u5bf9\u8c61\u3002\u5305\u542b\u5982\u4e0b\u56db\u4e2a\u65b9\u6cd5\uff1a<\/p>\n
    \n
  1. mark<\/code> \u5728\u76ee\u6807\u5143\u7d20\u4ee5\u53ca\u79fb\u52a8\u5143\u7d20\u4e0a\u901a\u8fc7data-center<\/code>\u81ea\u5b9a\u4e49\u5c5e\u6027\u6807\u8bb0\u5f53\u524d\u7684\u4e2d\u5fc3\u5750\u6807\uff0c\u5982-234, -345<\/code>. \u6b64\u65b9\u6cd5\u4e3b\u8981\u7528\u5728demo\u4e2d\uff0c\u65b9\u4fbf\u6d4b\u8bd5\u4e0e\u9884\u89c8\u7528\u7684\u3002\u5b9e\u9645\u53ef\u80fd\u7528\u9014\u4e0d\u5927\u3002<\/li>\n
  2. position<\/code> \u91cd\u65b0\u83b7\u53d6\u5143\u7d20\u7684\u4f4d\u7f6e\u3002\u5728\u5143\u7d20\u76f8\u5bf9\u4f4d\u7f6e\u6539\u53d8\u7684\u65f6\u5019\uff0c\u6b64\u65b9\u6cd5\u5f88\u6709\u7528\u3002\u5426\u5219\u4f1a\u51fa\u73b0\u8ba1\u7b97\u8bef\u5dee\u7684\u60c5\u51b5\u3002\u4f8b\u5982\uff0c\u9875\u9762\u5e03\u5c40\u662f\u81ea\u9002\u5e94\u6216\u8005\u54cd\u5e94\u5f0f\u7684\uff0c\u6d4f\u89c8\u5668\u5bbd\u5ea6\u53d8\u5c0f\u4e86\uff0c\u4e24\u5143\u7d20\u4e4b\u95f4\u7684\u8ddd\u79bb\u53d8\u5316\u4e86\uff0c\u6b64\u65f6\u9700\u8981\u6267\u884c\u4e0bposition<\/code>\uff0c\u5b58\u50a8\u65b0\u7684\u5750\u6807\u4f4d\u7f6e\u3002<\/li>\n
  3. move<\/code> \u89e6\u53d1\u629b\u7269\u7ebf\u8fd0\u52a8\u3002<\/li>\n
  4. init<\/code> \u521d\u59cb\u5316\u65b9\u6cd5\u3002\u5b9e\u9645\u4e0a\u5c31\u662f\u8fde\u7eed\u8c03\u7528position<\/code>, mark<\/code>, move<\/code>3\u4e2a\u65b9\u6cd5\u3002<\/li>\n<\/ol>\n
    demo\u70b9\u51fb\u9875\u9762\u4efb\u610f\u4f4d\u7f6e\u89e6\u53d1\u629b\u7269\u7ebf\u8fd0\u52a8\u5c31\u662f\u8fd9\u4e48\u89e6\u53d1\u7684\uff1a<\/p>\n
    \n
    \n\/* \u5143\u7d20 *\/<\/span>\nvar element = document.getElementById(\"element\"), \n    target = document.getElementById(\"target\");\n\/\/ \u629b\u7269\u7ebf\u5143\u7d20\u7684\u7684\u4f4d\u7f6e\u6807\u8bb0<\/span>\nvar parabola = funParabola(element, target).mark();\n\/\/ \u629b\u7269\u7ebf\u8fd0\u52a8\u7684\u89e6\u53d1<\/span>\ndocument.body.onclick = function() {\n    element.style.marginLeft = \"0px\";\n    element.style.marginTop = \"0px\";\n    parabola.init();<\/span>\n};<\/pre>\n<\/div>\n
    \u53c2\u6570\u8bf4\u660e\uff1a<\/strong><\/p>\n