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JavaScript verification email (3 methods)_javascript skills

WBOYOriginal: 2016-05-16 15:38:412946browse

Today I recommend three JavaScript email verification methods. I hope it will be helpful to your learning.
The first one: javascript verification email format

<SCRIPT LANGUAGE=javascript RUNAT=Server>
function isEmail(strEmail) {
if (strEmail.search(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/) != -1)
return true;
else
alert("oh");
}
</SCRIPT>
<input type=text onblur=isEmail(this.value)>

Second: Use Javascript to verify whether the email is filled in correctly

<html>
<head>
<title>test</title>
<script language="javascript">
function emailCheck () {
var emailStr=document.all.form1.tel.value;
alert(emailStr);
var emailPat=/^(.+)@(.+)$/;
var matchArray=emailStr.match(emailPat);
if (matchArray==null) {
alert("电子邮件地址必须包括 ( @ 和 . )")
return false;
}
return true;
}
</script>
</head>

<body>
<form name="form1">
<input type="text" name="tel"/>
<input type="button" value="press" onclick="emailCheck()"/>
</form>


</span>
</body>
</html>

The third type: js verification Email

function char_test(chr) 
//字符检测函数 
{ 
var i; 
var smallch="abcdefghijklmnopqrstuvwxyz"; 
var bigch="ABCDEFGHIJKLMNOPQRSTUVWXYZ"; 
for(i=0;i<26;i++) 
if(chr==smallch.charAt(i) || chr==bigch.charAt(i)) 
 return(1); 
return(0); 
} 

function spchar_test(chr) 
//数字和特殊字符检测函数 
{ 
var i; 
var spch="_-.0123456789"; 
for (i=0;i<13;i++) 
 if(chr==spch.charAt(i)) 
 return(1); 
return(0); 
} 

function email_test(str) 
{ 
var i,flag=0; 
var at_symbol=0; 
//“@”检测的位置 
var dot_symbol=0; 
//“.”检测的位置 
if(char_test(str.charAt(0))==0 ) 
return (1); 
//首字符必须用字母 

for (i=1;i<str.length;i++) 
if(str.charAt(i)=='@') 
 { 
 at_symbol=i; 
 break; 
 } 
//检测“@”的位置 

if(at_symbol==str.length-1 || at_symbol==0) 
return(2); 
//没有邮件服务器域名 

if(at_symbol<3) 
return(3); 
//帐号少于三个字符 

if(at_symbol>19 ) 
return(4); 
//帐号多于十九个字符 

for(i=1;i<at_symbol;i++) 
if(char_test(str.charAt(i))==0 && spchar_test(str.charAt(i))==0) 
 return (5); 
for(i=at_symbol+1;i<str.length;i++) 
if(char_test(str.charAt(i))==0 && spchar_test(str.charAt(i))==0) 
 return (5); 
//不能用其它的特殊字符  
 
for(i=at_symbol+1;i<str.length;i++) 
if(str.charAt(i)=='.') dot_symbol=i; 
for(i=at_symbol+1;i<str.length;i++) 
if(dot_symbol==0 || dot_symbol==str.length-1) 
//简单的检测有没有“.”，以确定服务器名是否合法 
return (6); 
 
return (0); 
//邮件名合法 
}

The above is the JavaScript email verification method. Have you learned it?

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