1         function preventAjax(obj,num){ 2             obj.disabled = true; 3             var num = num; 4             var types =obj.type; 5             if(types == 'submit'){ 6                 var text = obj.value; 7                 var time1 = setInterval(function(){ 8                     obj.value = num; 9                     num--;10                     if(obj.value <= 0 ){11                         clearInterval(time1);12                         obj.disabled = false;13                         obj.value = text;14                     }15                 },1000);16             }else{17                 var text = obj.innerHTML18                 var time1 = setInterval(function(){19                     obj.innerHTML = num;20                     num--;21                     if(obj.innerHTML <= 0 ){22                         clearInterval(time1);23                         obj.disabled = false;24                         obj.innerHTML = text;25                     }26                 },1000);27             }28         }

绑定事件即可调用：