重點：jQuery的 attr 和 removeAttr 兩個函數，主要是元素button的disabled屬性。
Demo： 複製代碼 代碼如下:<body>
<a class="disabled">Button disabeld</a> <a class="abled">Button abled</a><br/><br/>
<input type="button" id="submit" name="submit" value="submit">
</body>
<script type="text/javascript" src="../jquery-1.2.6.js"></script>
<script type="text/javascript">
$(function(){
//使其失效
$(".disabled").click(function(){
$("#submit").attr("disabled","disabled");
$("#submit").val('disabled...');
});
//啟用
$(".abled").click(function(){
$("#submit").removeAttr("disabled");
$("#submit").val('submit');
});
//操作請求
$("#submit").click(function() {
$("#submit").attr("disabled", "disabled");
alert("hi");//send ajax request
$("#submit").removeAttr("disabled");
});
});
</script>
說明：當點擊"Button disabeld"後，使用 $( "#submit" ).attr("disabled","disabled") 語句禁用測試按鈕，實質是給測試按鈕增加一個disabled屬性，然後點擊"Button abled"或執行發送ajax()請求，當請求完全後，使用 $("#submit").removeAttr("disabled"); 語句去除禁用按鈕屬性，從而實現了禁用按鈕，避免重複發送請求。
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