javascript產生驗證碼

來源:互聯網
上載者:User

標籤:javascript   驗證碼   border   color   

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 

<html xmlns="http://www.w3.org/1999/xhtml" > 

<head> 

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<title>javascript 驗證碼實現代碼_指令碼之家測試</title> 

<style type="text/css"> 

.code 

{}{ 

background-image:url(code.jpg); 

font-family:Arial; 

font-style:italic; 

color:Red; 

border:0; 

padding:2px 3px; 

letter-spacing:3px; 

font-weight:bolder; 

.unchanged 

{}{ 

border:0; 

</style> 

<script language="javascript" type="text/javascript"> 


var code ; //在全域 定義驗證碼 

function createCode() 

code = ""; 

var codeLength = 6;//驗證碼的長度 

var checkCode = document.getElementById("checkCode"); 

var selectChar = new Array(0,1,2,3,4,5,6,7,8,9,‘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‘);//所有候選組成驗證碼的字元,當然也可以用中文的 


for(var i=0;i<codeLength;i++) 



var charIndex = Math.floor(Math.random()*36); 

code +=selectChar[charIndex]; 



if(checkCode) 

checkCode.className="code"; 

checkCode.value = code; 



function validate () 

var inputCode = document.getElementById("input1").value; 

if(inputCode.length <=0) 

alert("請輸入驗證碼!"); 

else if(inputCode != code ) 

alert("驗證碼輸入錯誤!"); 

createCode();//重新整理驗證碼 

else 

alert("OK"); 



</script> 

</head> 

<body onload="createCode()"> 

<form action="#"> 

<input type="text" id="input1" /> 

<input type="text" readonly="readonly" id="checkCode" class="unchanged" style="width: 80px" />

 

<input id="Button1" type="button" value="確定" /> 

</form> 

</body> 

</html> 


javascript產生驗證碼

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