效果：
代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>效验meail</title>
</head>
<body>
<br>
<center>
<form>
邮箱地址：<input name="meail_input_name" type = "text" id="meail_input_id" value="" placeholder="请输入正确的邮箱">
<input name="meail_check_name" type = "button"id="meail_check_id" value="效验邮箱" onclick="checkMeail()">
</form>
</center>
</br>
</body>
<script type="text/javascript">
function checkMeail(){
var meailAddress=document.getElementById("meail_input_id").value;
//长度
var meailLength = meailAddress.length;
//判断含有@，“.”
var index1 = meailAddress.indexOf("@");
var index2 = meailAddress.indexOf(".");
var msg = "效验输入的邮箱号n";
msg = "@所在的索引：==：" index1;
msg = "\\\’.\\\’所在的索引：==：" index2;
msg ="邮箱地址：" meailAddress "n";
msg ="验证邮箱地址的实例："
if (index1==-1||index2==-1||index1<index2) {
msg ="邮箱的基本要求:" "n";
msg ="必须含有\\\’@\\\’和\\\’.\\\’ n";
msg ="\\\’.\\\’必须在\\\’@\\\’后面n";
}else{
msg = "符合要求";
};
alert(msg);
}
</script>
</html>
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