CSS代码 背景透明内容不透明
摘要：前端开发面试和面试官交流 ipad前端开发软件 资深前端开发面试问题 背景透明，内容不透明css代码 代码片段 1 <!DOCTYPE html> <html> <head> <meta charset=”UTF-8″> ……
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背景透明，内容不透明css代码
代码片段 1
<!DOCTYPE html>
<html>
<head>
<meta charset=”UTF-8″>
<title>背景透明，内容不透明css代码生成器</title>
<script>
if (window.top != window) {
window.top.location.href = window.location.href;
}
</script>
</head>
<body>
<style type=”text/css”>
#hananBackgroundColorOpacity {
margin: 10px;
}
#hananBackgroundColorOpacity span {
margin-left: 10px;
color: #8a8c8e;
}
#hananBackgroundColorOpacity textarea {
width: 650px;
height: 120px;
padding: 5px;
color: #fff;
background: #000;
}
#hananBackgroundColorOpacity strong {
color: #000;
}
#hananBackgroundColorOpacity h3 {
color: #000;
border-bottom: 1px solid #ccc;
line-height: 57px;
}
#hananBackgroundColorOpacity h3 img {
float: right;
}
#hananBackgroundColorOpacity h3 .c {
clear: both;
height: 0px;
margin: 0;
padding: 0;
}
#hananBackgroundColorOpacity .hanan_introduction,
#hananBackgroundColorOpacity .hanan_introduction a {
font-size: 12px;
color: #6E6E6E;
}
#hananBackgroundColorOpacity img {
border: none;
}
</style>
<div id=”hananBackgroundColorOpacity”>
<p class=”hanan_introduction “>
说明：为页面元素添加背景透明，内容不透明的效果，兼容IE6/7/8/9/10、Chrome、Firefox、Safari、Opera。
</p>
<p>选择器：<input id=”hananDomChooser” type=”text” value=”” /><span>id或者class等css选择器,比如:<strong>#abc</strong></span></p>
<p>颜色值：<input id=”hananColorValue” type=”text” value=”” /><span>16进制颜色值,不带#号,比如:<strong>#c77eb5</strong>,请填:<strong>c77eb5</strong></span></p>
<p>透明度：<input id=”hananOpacity” type=”text” value=”” /><span><strong>0</strong>到<strong>1</strong>之间,比如:<strong>0.5</strong></span></p>
<p><input id=”hananGetCssCodeButon” type=”button” value=”生成CSS代码” /></p>
<p>
CSS代码：<br/>
<textarea id=”hananCssCode” type=”text” /></textarea>
</p>
<p class=”hanan_introduction “>
实现原理参考：<a href=”http://www.cssha.com/through-the-ie-private-filter-let-ie6-ie7-ie8-support-transparent-background” target=”_blank”>http://www.cssha.com/through-the-ie-private-filter-let-ie6-ie7-ie8-support-transparent-background</a>
</p>
</div>
<script type=”text/javascript”>
// <![CDATA[
function hananColorToRGB(col, opa) {
var c = col
var R = parseInt(c.substring(0, 2), 16), G = parseInt(c.substring(2, 4), 16), B = parseInt(c.substring(4), 16);
return ‘rgba(‘ + R + ‘,’ + G + ‘,’ + B + ‘,’ + opa + ‘)’;
}
function smallToBig(col) {
var str = ”;
if (col.length == 6) {
str = col;
} else {
var _r = col.substring(0, 1), _g = col.substring(1, 2), _b = col.substring(2);
_r += _r;
_g += _g;
_b += _b;
str = _r + _g + _b;
}
return str;
}
function hananGetCssCode() {
var chooser = document.getElementById(‘hananDomChooser’).value;
var col = smallToBig(document.getElementById(‘hananColorValue’).value);
var opa = document.getElementById(‘hananOpacity’).value;
var rgb = hananColorToRGB(col, opa);
var iecol = parseInt((opa * 255)).toString(16) + col;
if (chooser == ” || col == ” || opa == ”) {
alert(‘选择器、颜色值、透明度都要填完哦亲！’);
} else {
document.getElementById(‘hananCssCode’).value = chooser + ‘{background:’ + rgb + ‘;filter:progid:DXImageTransform.Microsoft.gradient(startColorstr=#’ + iecol + ‘,endColorstr=#’ + iecol + ‘);zoom:1;}’ +
‘\r\n:root ‘ + chooser + ‘{filter:none\9;}/*for IE9*/’;
}
}
window.onload = function () {
document.getElementById(‘hananGetCssCodeButon’).onclick = function () {
hananGetCssCode();
}
}
// ]]>
</script>
</body>
</html>
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