<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<input type="text" name="QQ" id="QQ" value="" />
<span></span>
<pre style="color: red;font-size: 30px;">
QQ的规则：
1. 全都是数字
2. 最少5最多11
3. 开头不能为0
</pre>
<script type="text/javascript">
let qq = document.querySelector(‘#QQ‘);
let span = document.querySelector(‘span‘);
let re = /^[1-9]\d{5,11}$/
qq.oninput = function(){
if(re.test(qq.value)){
span.innerHTML = ‘恭喜你‘
}else{
span.innerHTML = ‘别闹，好好写‘
}
}
</script>
</body>
</html>
WEB前端学习交流群21 598399936