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js+css=html驗證碼驗證

var code ; //在全域性 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; checkCode.blur(); } } function validate () { var inputCode = document.getElementById("validCode").value; if(inputCode.length <=0) { alert("請輸入驗證碼!"); } else
if(inputCode.toUpperCase() != code ) { alert("驗證碼輸入錯誤!"); createCode();//重新整理驗證碼 } else { alert("^-^ OK"); } }