微信小程序 setData使用方法及常用错误解决办法

Page({
 data: {
  array: [{text: 'init data'}],
 },
 changeItemInArray: function() {
  this.setData({
   'array[0].text':'changed data'
  })
 }
})

var param = {};
var string = "array["+index+"].text;
param[string] = 'changed data';
that.setData(param);

 markers: {
   iconPath: "/picture/bike.png",
   id: 0,
   latitude: 23.099994,
   longitude: 113.324520,
   width: 50,
   height: 50
  }

for(var i = 0; i < res.data.length; i++){
       // that.data.markers[i].id=i;
        // mark.id=i;
       var param = {};
       var string = "markers["+i+"].id";
       param[string] = res.data[i].Bike_id;       
        that.setData(param);


       var string="markers["+i+"].iconPath";
       param[string] ="/picture/bike.png";
       that.setData(param);


       var string = "markers["+i+"].latitude";
       param[string] = res.data[i].BIKE_latitude;       
        that.setData(param);
     


       var string = "markers["+i+"].longitude";
       param[string] = res.data[i].BIKE_longitude;       
        that.setData(param);




        var string = "markers["+i+"].width";
       param[string] = 50;       
        that.setData(param);


        var string = "markers["+i+"].height";
       param[string] = 50;       
        that.setData(param);
        /* that.setData({
        markers:[{
   iconPath: "/picture/bike.png",
   id: 0,
   latitude: 23.099994,
   longitude: 113.324520,
   width: 50,
   height: 50
        }]
       })*/
       }
     //   console.log(res.data[1])
       var markk=that.data.markers;
       that.setData({markers:markk})