input type="button" value=" 失效5秒 " onclick="this.disabled=true;setTimeout('this.disabled=false',5000);">

?

<input type="button" value=" 失效5秒 " onclick="{
? this.disabled = true;
? var me = this;
? setTimeout(function() { me.disabled = false; }, 5000);
}">

?

<input type="button" value="失效5秒" onclick="setTimeout((function(me){me.disabled=true;return function(){me.disabled=false;};})(this),5000);">

<input type="button" value=" 失效5秒 " id="me" onclick="this.disabled=true;setTimeout('me.disabled=false',5000);">

<input type="button" value="失效5秒" onclick="setTimeout((function(Mes){Mes.disabled=true;return function(){Mes.disabled=false;};})(this),5000);">