var lessons=new Vue({
  el:"#lessons",
  data:{
    lessons:[
      {name:"英语", teacher: '赵六', id:1,checked:true},
      {name:"数学", teacher: '王五', id:2,checked:true},
      {name:"语文", teacher: '李四', id:3,checked:true},
      {name:"233", teacher: '张三', id:4,checked:true},
    ]
  },
  methods: {
      onMouseEnter: function (id) {
        console.log(id)
      },
      onMouseLeave: function () {
      
      }
  },
  computed:{
    selectAll:{
      get:function(){ return this.$data.lessons.every(function(x){ return x.checked==true }) },
      set:function(checked){ this.$data.lessons.map(function(x){x.checked=checked}) }
    }
  }
})