小程序setData修改属性

data: {
    itemUrl:[
      {
        name:'',
        url:'../../images/item1.png'
      },
      {
        name: '',
        url: '../../images/item2.png'
      },
      {
        name: '',
        url: '../../images/item3.png'
      },
      {
        name: '',
        url: '../../images/item4.png'
      },
      {
        name: '',
        url: '../../images/item5.png'
      },
      {
        name: '',
        url: '../../images/item6.png'
      },
      {
        name: '',
        url: '../../images/item7.png'
      },
      {
        name: '',
        url: '../../images/item8.png'
      },
      {
        name: '',
        url: '../../images/item9.png'
      }
    ]

  },
  onLoad: function () {
    var wx = this;
   setInterval(function(){
     var x = Math.floor(Math.random() * 8 + 1);
     var that = 'itemUrl[' + x + '].name';// 先用一个变量，把itemUrl.name用字符串拼接起来
     for (var i = 0; i <wx.data.itemUrl.length; i++) {

　　　　var all = 'itemUrl[' + i + '].name';
       wx.setData({
         [all]: ''  // 使用【】将字符串包起来，为其赋值
       })
     }
     wx.setData({
       [that]: 'active'  // 使用【】将字符串包起来，为其赋值
     })
   },3000)
   
  }
})