PHP
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<?php
// put your code here
?>
<input type="text" id="veri"><section id="s1"></section><section id="s2"></section>
<button onclick="check()">提交</button>
<script src="js.js"></script>
</body>
</html>
JS
/* 设置id*/
function $(id){
return document.getElementById(id);
}
/*生成验证码*/
var v="";
window.onload=f1;
function f1(){
var s=new Array(0,1,2,3,4,5,6,7,8,9);
for(var i=0;i<4;i++){
var r=Math.floor(10*Math.random());
var a=s[r];
v+=a;
}
$('s1').innerHTML=v;
}
/*检验验证码*/
;
function check(){
var veri=$('veri').value;
if(veri!==v){
window.location.reload();
}
else{
$('s2').innerHTML="Right";
}
}