验证码倒计时
1 <style> 2 .btn{ 3 color:red; 4 } 5 .dian{ 6 color:green; 7 } 8 </style> 9 <body> 10 <input type="button" class="btn" value="获取验证码" onclick="dao(15,this)"> 11 </body> 12 </html> 13 <script src="jquery-1.8.1.min.js"></script> 14 <script> 15 var shi 16 function dao(miao,obj){ 17 if(miao > 1){ 18 miao --; 19 miao > 9 ? shi = miao :shi = "0" + miao; 20 $(obj).val(shi + ‘‘ + "s后重试").attr("disabled",true); //按钮禁用 21 $(obj).addClass("dian"); 22 setTimeout(function(){ 23 dao(miao,obj) 24 },1000); 25 }else{ 26 $(obj).val("获取验证码").attr("disabled",false) //按钮可用 27 $(obj).removeClass("dian"); 28 } 29 } 30 </script>
原文：https://www.cnblogs.com/xiaoyaolang/p/11882635.html