JavaScript 错误：代码执行顺序问题
<p>There is an error in the code. The JavaScript code is called before the HTML element with the id 'jj' is defined. To fix this, move the script tag to the end of the body section or use window.onload to ensure the HTML is loaded before the JavaScript is executed.</p>
<p>Corrected code:</p>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style>
#jj{
width: 300px;
height: 150px;
background-color: aqua;
}
</style>
</head>
<body>
<div id="jj">代码一</div>
<script>
var mydiv = document
.getElementById("jj");
mydiv.onmouseover=
function(){
mydiv.style.background="red"
mydiv.innerHTML = '鼠标移入状态'
};
mydiv.onmouseout =
function(){
mydiv.style.background = "blue"
mydiv.innerHTML = '鼠标移除状态'
}
</script>
</body>
</html>
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