checkbox解决手动点击后全选功能失效

function changeCheck(el){//将html节点转为对象var obj = jQuery(el);var pid = obj.val();//判断是否选中if(obj.is(':checked')){$("input[pid^='"+pid+"_']").each(function(){                  this.checked=true;              });}else{$("input[pid^='"+pid+"_']").each(function(){                  this.checked=false;              });}}