本文介绍了一种使用JavaScript实现的函数方法，用于检测输入的邮箱地址是否包含特定的特殊字符。通过双重循环遍历的方式，确保了每个字符都被仔细检查。
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>函数法检查字符</title>
<script type="text/javascript">
var arr=["!","@","#","<",">","%","&","*","/","\\"];
var str=window.prompt("请输入一个邮箱号！");
function checkChat(username)
{
for(var a=0; a<arr.length; a++)
{
for(var b=0; b<username.length; b++)
{
if(arr[a]==username.charAt(b))
{
return true;
}
}
}
return false;
}
if(checkChat(str))
{
document.write("<font color='red'>该邮箱含有特殊字符！</font>")
}else{
document.write("<font color='blue'>该邮箱合法！</font>")
}
</script>
</head>
<body>
</body>
</html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>函数法检查字符</title>
<script type="text/javascript">
var arr=["!","@","#","<",">","%","&","*","/","\\"];
var str=window.prompt("请输入一个邮箱号！");
function checkChat(username)
{
for(var a=0; a<arr.length; a++)
{
for(var b=0; b<username.length; b++)
{
if(arr[a]==username.charAt(b))
{
return true;
}
}
}
return false;
}
if(checkChat(str))
{
document.write("<font color='red'>该邮箱含有特殊字符！</font>")
}else{
document.write("<font color='blue'>该邮箱合法！</font>")
}
</script>
</head>
<body>
</body>
</html>
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