Do not use meaningless repetition JS selection operation, we should adopt variable localization

E.g:

    $('tbody input').on('change',function(){
      //有任意一个checkbox选中就显示，反之隐藏
     $('tbody input').each(function(i,item){
			//content
      })

The code may be replaced with the following form

 //变量的本地化
var $tbodyCheckBoxs=$('tbody input')
    $tbodyCheckBoxs.on('change',function(){
      $tbodyCheckBoxs.each(function(i,item){
      	//content
      })