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<!DOCTYPE HTML>
<html>
<head>
</head>
<body>
<h3 > enter a capcha </h3>
<canvas id = "capchaGen" width="40" height="20"> </canvas>
<button id = "rst" onclick = "a()"> get</button>
<br />
<input type = "text" placeholder = "capcha" name = "capchaIn" class ="box" id="capchaIn"required>
<button
id ="end" onclick = "c()">
ok
</button>
<script>
var pass = '';
var capha = document.getElementById("capchaGen");
var cap = capha.getContext("2d");
function a(){
cap.clearRect(0, 0, 40, 20);
cap.strokeText(gen_pass() ,5,15);
}
function c(){
var val=document.getElementById("capchaIn").value;
if(val ==pass){
alert("accept")
///////site////site/////сайт
window.open("https://google.com","_self")
}
else{
alert("invalid capcha")
a();
}
}
chr = new Array('A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z',
'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z',0,1,2,3,4,5,6,7,8,9);
function rnd(x,y,z) {
var num;
do {
num = parseInt(Math.random()*z);
if (num >= x && num <= y) break;
} while (true);
return(num);
}
function gen_pass() {
pass ='';
for (var i = 0; i < 5; i++) pass += chr[rnd(0,61,100)];
return pass;
}
a();
</script>
<style>
canvas{
border-style:solid;
background-color:#c7a956 ;
border-width:1px;
border-color: rgba(0,0,0,0.5)
}
.box{
color:red;
width:80px;
}
h3{
color:green;
}
</style>
</body>
Капча. Обсирайте как можете.