<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
<script>
function yuan(){
document.write('<ul>');
document.write('<li style="width:70px;border: 1px solid black;list-style-type: none' +
'" onclick="tow()">电子产品</li>');
document.write('</ul>');
}
function tow(){
document.write('<ul>');
document.write('<li style="float: left;border: 1px solid black;list-style-type: none">电子产品');
document.write('</li>');
document.write('<ul style="display: inline-block;float: left;padding-left:0;margin-left: 10px;border: 1px solid black;list-style-type: none">');
document.write('<li>手机</li>');
document.write('<li>电脑</li>');
document.write('<li>学习机</li>');
document.write('</ul>');
document.write('</ul>');
}
yuan();
</script>
</head>
<body>
</body>
</html>
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