<input type="button" id="btn" value="免费获取验证码" /> <script type="text/javascript"> var wait=60; function time(o) { if (wait == 0) { o.removeAttribute("disabled"); o.value="免费获取验证码"; wait = 60; } else { o.setAttribute("disabled", true); o.value="重新发送(" + wait + ")"; wait--; setTimeout(function() { time(o) }, 1000) } } document.getElementById("btn").onclick=function(){time(this);alert('aaaaaa');} </script>收集有效用户，为了防止用户多次点击某按钮，造成多次提交表单的操作。某些按钮需要在点击后实现不可用操作。发送使用ajax实现
例子：
<html> <head> <title>同意条款</title> </head> <body> <form id="form1" name="form1" method="post" action=""> <input type="submit" name="Submit" value="同意" /> </form> <script language="javascript"> document.form1.Submit.disabled = true; var wait = 9; //停留时间 function updateinfo(){ if(wait == 0){ document.form1.Submit.value = "我同意"; document.form1.Submit.disabled = false; } else{ document.form1.Submit.value = "阅读条款"+wait; wait--; window.setTimeout("updateinfo()",1000); } } updateinfo(); </script> </body> </html> 设置按钮的不可用 用到了 disabled属性。
语法：
object.disabled = false | true;例子：w3cschool
<html> <head> <script type="text/javascript"> function disable() { document.getElementById('txt1').disabled=true; } function enable() { document.getElementById('txt1').disabled=false; } </script> </head> <body> <textarea id="txt1"> Hello world....This is a text area </textarea> <br /> <input type="button" onclick="disable()" value="Disable" /> <input type="button" onclick="enable()" value="Enable" /> </body> </html>
来源:https://my.oschina.net/mickelfeng/blog/109038