In JavaScript, you can use the style object attribute to change the background color. The syntax format is "element object.style.background="color value"". The Style object represents a single style declaration and can be accessed from the document or element to which the style is applied.
The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.
<html>
<head></head>
<body>
<ul id="ul1">
<li></li>
<li></li>
<li></li>
<li class="box"></li>
<li></li>
<li class="box"></li>
<li class="box"></li>
<li></li>
<li></li>
<li></li>
</ul>
</body>
</html>
<script>
window.onload = function () {
//获取名字ul1的ID
var oUl = document.getElementById("ul1");
//获取li标签
var aLi = oUl.getElementsByTagName("li");
//循环li
for (var i = 0; i < aLi.length; i++) {
//判断li标签名字为className为box
if (aLi[i].className == "box") {
//给li标签加背景色
aLi[i].style.background = "red";
}
}
};
</script>[Recommended learning: javascript advanced tutorial]
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