<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<input type="text" placeholder="请输入邮箱" id="email">
</body>
<script>
email.onchange = function(){
var email = this.value;
var reg = /^([a-zA-Z]|[0-9])(\w|\-)+@[a-zA-Z0-9]+\.([a-zA-Z]{2,4})$/;
if(reg.test(email)){
alert("邮箱格式正确");
}else{
alert("邮箱格式不正确");
}
}
</script>
</html>
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta
阅读背景：
JS之正则表达式之邮箱的验证
来源：互联网
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