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1.标签代码  var code;  function createCode(){   code="";   var codeLength = 4;   var checkCode = document.getElementById("code");   var random = new Array(0,1,2,3,4,5,6,7,8,9,'A','B','C','D','E','F','G','

js部分<script type="text/javascript">     var countdown=60;     function settime(obj) {         if (countdown == 0) {             obj.removeAttribute("disabled");                obj.value="免费获取验证码...