javascript - 使用 Javascript 创建 CSS 样式表

Question

我正在尝试使用 javascript 创建 CSS 样式表。代码是:

<script type="text/javascript">
function colorSquare()
{
 var elem = document.getElementById("body");
 document.getElementById("body").innerHTML = "<style>";
 document.getElementById("body").innerHTML += ".myAnimation";
 document.getElementById("body").innerHTML += "{";
 document.getElementById("body").innerHTML += "width: 50px";
 document.getElementById("body").innerHTML += "height: 50px";
 document.getElementById("body").innerHTML += "position: absolute;";
 document.getElementById("body").innerHTML += "background: #0000FF;";
 document.getElementById("body").innerHTML += "background: url(data:image/svg+xml;base64,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)"
 document.getElementById("body").innerHTML += "background: -moz-radial-gradient(center, ellipse cover,  #0000FF 0%, #0000FF 0%, #ff0000 100%);";
 document.getElementById("body").innerHTML += "background: -webkit-gradient(radial, center center, 0px, center center, 100%, color-stop(0%,#0000FF), color-stop(0%,#ff0000), color-stop(100%,#ff0000));";
 document.getElementById("body").innerHTML += "background: -webkit-radial-gradient(center, ellipse cover,  #0000FF 0%,#0000FF 0%,#ff0000 100%);";
 document.getElementById("body").innerHTML += "background: -o-radial-gradient(center, ellipse cover,  #0000FF 0%,#0000FF 0%,#ff0000 100%);";
 document.getElementById("body").innerHTML += "background: -ms-radial-gradient(center, ellipse cover,  #0000FF 0%,#0000FF 0%,#ff0000 100%);";
 document.getElementById("body").innerHTML += "background: radial-gradient(ellipse at center,  #0000FF 0%,#0000FF 0%,#ff0000 100%)";
 document.getElementById("body").innerHTML += "filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#0000FF', endColorstr='#ff0000',GradientType=1 );";
 document.getElementById("body").innerHTML += "border-style: solid;";
 document.getElementById("body").innerHTML += "border-width: 3px;";
 document.getElementById("body").innerHTML += "border-color:#77dd77;";
 document.getElementById("body").innerHTML += "border-radius: 5px;";
 document.getElementById("body").innerHTML += "-webkit-box-shadow:0 0 10px black;";
 document.getElementById("body").innerHTML += "-moz-box-shadow: 0 0 10px black;";
 document.getElementById("body").innerHTML += "box-shadow:0 0 10px black;";
 document.getElementById("body").innerHTML += "text-align: white;";
 document.getElementById("body").innerHTML += "text-align: center;";
 document.getElementById("body").innerHTML += "line-height: 45px;";
 document.getElementById("body").innerHTML += "</style>}";

}
</script>

我这样做对吗？如果不是，使用 javascript 创建 CSS 样式表的正确方法是什么。

谢谢，

以赛亚书

Answer 1

即使您的代码可能有效(未经测试不确定)它看起来很乱..您应该真正将 css 放在头部。

你可以做这样的事情..你可以添加任意多的样式到你的newCSS变量，这意味着代码看起来会更好看，但功能也会更好更少的代码行。

// add your styles here
var newCSS = '.myAnimation { width: 50px; }';
var head = document.head || document.getElementsByTagName('head')[0];
var style = document.createElement('style');

style.type = 'text/css';
if (style.styleSheet){
  style.styleSheet.cssText = css;
} else {
  style.appendChild(document.createTextNode(css));
}

head.appendChild(style);