表单选中变色，隔行有色

image.png

• row:行
• tbody记得加上
  思想：把旧的颜色暂存。就不会使得变色时，旧颜色没了。

 var otb = document.getElementById('mytable') 

  var oldColor = ''
  for(var i=0; i<otb.tBodies[0].rows.length;i++){

    otb.tBodies[0].rows[i].onmouseover = function(){
      oldColor = this.style.background
      this.style.background = 'yellow'
    }
    otb.tBodies[0].rows[i].onmouseout = function(){
      this.style.background = oldColor
    }


    if(i%2){
      otb.tBodies[0].rows[i].style.background='#ccc'
    }else{
      otb.tBodies[0].rows[i].style.background=''
    }
  }