得到元素真實(shí)的背景顏色的js代碼

2019-11-21 01:50:19

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<html>  <head>  <title>得到元素真實(shí)的背景顏色</title>  <style>  .classname  {background-color:#ff99dd;}  #div3  {background-color:#d8bfd8;}  div  {background-color:#87cefa;border:1px solid #333333;margin:10px;padding:4px;}  body  {background-color:#bed742;}  #div4  {background-color:transparent;}  </style>  </head>  <body>  <span style="text-align:center;font-size:20px;color:#ff7f50;width:100%;">得到元素真實(shí)的背景顏色 <font style="font-size:12px;">By <a href=http://longbill.cn target=_blank>Longbill</a></font></span>  <div   class="iwvjtn8m0"   id='div1'>div1 直接通過div標(biāo)簽定義背景色(#87cefa)</div>  <div   class="iwvjtn8m0"   id='div2' class=classname>div2 通過class name定義背景色(#ff99dd)</div>  <div   class="iwvjtn8m0"   id='div3'>div3 通過id定義背景色(#d8bfd8)</div>  <div   class="iwvjtn8m0"   id='div4'>div4 這是一個(gè)透明的div，背景色應(yīng)為上一個(gè)元素的顏色(#bed742)</div>  <button onclick="go()">getBg()</button>  <script>  function getBg(element)  {//author: Longbill (www.longbill.cn)  //dnew.cn修補(bǔ)    var rgbToHex=function(rgbarray,array){        if (rgbarray.length < 3) return false;        if (rgbarray.length == 4 && rgbarray[3] == 0 && !array) return 'transparent';        var hex = [];        for (var i = 0; i < 3; i++){          var bit = (rgbarray[i] - 0).toString(16);          hex.push((bit.length == 1) ? '0' + bit : bit);        }        return array ? hex : '#' + hex.join('');      }  //---------------    if (typeof element == "string") element = document.getElementById(element);    if (!element) return;    cssProperty = "backgroundColor";    mozillaEquivalentCSS = "background-color";    if (element.currentStyle)      var actualColor = element.currentStyle[cssProperty];    else    {      var cs = document.defaultView.getComputedStyle(element, null);      var actualColor = cs.getPropertyValue(mozillaEquivalentCSS).match(//d{1,3}/g);  //-----      actualColor = (actualColor) ? rgbToHex(actualColor) : "transparent";    }    if (actualColor == "transparent" && element.parentNode)      return arguments.callee(element.parentNode);    if (actualColor == null)      return "#ffffff";    else      return actualColor;  }  function go()  {    for(var i=1;i<=4;i++) eval("alert('div"+i+":'+getBg('div"+i+"'));");  }  </script>  </body>  </html>

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