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Wechat applet cloud database value assignment to array error

2022-04-23 03:35:00 【CSDN Q & A】

The code is as follows ：
Page({
data: {
url:[], // Array
},

previewImage:function(event){
wx.cloud.database().collection("imgs").where({op:'1'}).get({
success:function(res){
for(var i=0;i<res.data.length;i++){
var newar = {
site:JSON.stringify(res.data[i].url)
};
this.data.url = this.data.url.concat(newar);// Array assignment
this.setData({
url:this.data.url
});
}
}
}),
wx.previewImage({
//urls: ["cloud://huqq12-5gd07ykk20bc150b.6875-huqq12-5gd07ykk20bc150b-1311173720/2.png"] // Contents of the desired array
urls: [url]
})
},
})
Report errors ：

img

database

img



Take the answer ：

Write it like this... Try it 

  previewImage:function(event){    var _this = this;  wx.cloud.database().collection("imgs").where({op:'1'}).get({  success:function(res){  for(var i=0;i<res.data.length;i++){  var newar = {  site:JSON.stringify(res.data[i].url)  };  let tempData = _this.data.url.concat(newar);// Array assignment   _this.setData({  url:tempData  });  }  }  }),  wx.previewImage({  //urls: ["cloud://huqq12-5gd07ykk20bc150b.6875-huqq12-5gd07ykk20bc150b-1311173720/2.png"] // Contents of the desired array   urls: [url]  })  }

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