jQuery实现统计复选框选中数量

       functioncountNum(){
         //alert($("input[name=check]:checked").length);
        vararrays=newArray();
         varitems=document.getElementsByName("check");
         for(vari=0;i<items.length;i++){
             if(items[i].checked){
                 arrays.push(items[i].value);
             }
         }
         alert(arrays.length);
       }