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)
   
  }
})