jquery实现提交后按钮变灰

<!-- // 所有submit按钮提交后变灰三秒
$(document).ready(function(){
$("input[type='submit']").click(
function(){
$(this).attr("disabled","true");
setTimeout("$(\"input:disabled\").removeAttr(\"disabled\")",3000);
})
});
-->

// 手动调用（button按钮变灰三秒）
function changeDisable(obj){
$("#"+obj).attr("disabled","true");
setTimeout("$(\"input:disabled\").removeAttr(\"disabled\")",3000);
}