<input type="button" id="btn" value="免費獲取驗證碼" /> <script type="text/javascript"> var wait=60; function time(o) { if (wait == 0) { o.removeAttribute("disabled"); o.value="免費獲取驗證碼"; wait = 60; } else { o.setAttribute("disabled", true); o.value="重新發送(" + wait + ")"; wait--; setTimeout(function() { time(o) }, 1000) } } document.getElementById("btn").onclick=function(){time(this);alert('aaaaaa');} </script>收集有效用戶，為了防止用戶多次點擊某按鈕，造成多次提交表單的操作。某些按鈕需要在點擊后實現不可用操作。發送使用ajax實現
例子：
<html> <head> <title>同意條款</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; //停留時間 function updateinfo(){ if(wait == 0){ document.form1.Submit.value = "我同意"; document.form1.Submit.disabled = false; } else{ document.form1.Submit.value = "閱讀條款"+wait; wait--; window.setTimeout("updateinfo()",1000); } } updateinfo(); </script> </body> </html> 設置按鈕的不可用 用到了 disabled屬性。
語法：
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>
來源:https://my.oschina.net/mickelfeng/blog/109038