两个小练习
1 <body> 2 <form> 3 <input type="text" id="a1" daan="1949" /> 4 <input type="button" value="提交" onclick="aa()" /> 5 <input type="button" value="同意10" id="a2" disabled="disabled" /> 6 </form> 7 </body> 8 </html> 9 <script> 10 function aa() 11 { 12 var a = document.getElementById("a1"); 13 var b = a.getAttribute("daan"); 14 var c = a.value; 15 if(b==c) 16 { 17 alert("正确"); 18 } 19 else 20 { 21 alert("错误"); 22 } 23 } 24 var n = 10; 25 function aaa() 26 { 27 var a = document.getElementById("a2"); 28 n--; 29 if(n == 0) 30 { 31 a.value = "同意"; 32 a.removeAttribute("disabled"); 33 } 34 else 35 { 36 a.value = "同意" + n; 37 window.setTimeout("aaa()",1000); 38 } 39 } 40 window.setTimeout("aaa()",1000); 41 </script>
第一个是对比答案是否正确，第二个是倒计时。
原文：http://www.cnblogs.com/mazhijie/p/5528645.html