The code copy is as follows:
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Form Verification</title>
<script language="javascript">
function check_1(param){//Not empty
if(param==""||param==null){return false;}else{return true;}
}
function check_2(param){//Length limit, letters are 10, Chinese characters are also 10.
if(param.length>10){return false;}else{return true;}
}
function check_3(param){//Only enter Chinese characters
var pattern= /^[/u4e00-/u9faf]+$/;
var flag = pattern.test(param);
if(flag==false){return false;}else{return true;}
}
function check_4(param){//Only enter numbers
var pattern= /^[0-9]+$/;
var flag = pattern.test(param);
if(flag==false){return false;}else{return true;}
}
function check_5(param){//Only input numeric letters underline
var pattern= /^[0-9a-zA-z_]+$/;
var flag = pattern.test(param);
if(flag==false){return false;}else{return true;}
}
function check_6(param){//Email format verification
var pattern= /^([a-zA-Z0-9]+[_|/_|/.]?)*[a-zA-Z0-9]+@([a-zA-Z0-9]+[_|/_|/.]?)*[a-zA-Z0-9]+/.[a-zA-Z]{2,3}$/;
var flag = pattern.test(param);
if(flag==false){return false;}else{return true;}
}
function check_7(param){//Website format verification
var pattern= /^((https|http|ftp|rtsp|mms)?:////)?(([0-9a-z_!~*'().&=+$%-]+: )?[0-9a-z_!~*'().&=+$%-]+@)?(([0-9]{1,3}/.){3}[0-9]{1,3}|([0-9a-z_!~*'()-]+/.)*([0-9a-z][0-9a-z-]{0,61})?[0-9a-z]/.[az]{2,6})(:[0-9]{1,4})?((//?)|(//[0-9a-z_!~*'().;?:@&=+$,%#-]+)+//?)$/;
var flag = pattern.test(param);
if(flag==false){return false;}else{return true;}
}
function check(){
var value=document.getElementById("testValue").value;
var result=check_7(value);//Set the name of the verification function here, I wrote seven commonly used form verification functions: check_1~check_7.
if(result==false){
document.getElementById("testValue").style.border="2px solid red";
}else{
//document.getElementById("testValue").style.border="2px solid green";
document.getElementById("testValue").style.border="";
}
}
</script>
</head>
<body>
<div style="text-align: center;padding: 200px 0;">
Please enter: <input id="testValue" name="" type="text"></input>
<input id="" name="" type="button" value="click to verify" onclick="check()"></input>
</div>
</body>
</html>