微信小程序 setData 数组赋值数组出错了？

this.setData({arr1:arr2});

然后排序arr2

var arr2=this.data.arr2;

for(var i=0;i<arr2.length-1;i++){

for(var j=0;j<arr2.length-i-1;j++){

if(arr2[j]>arr2[j+1]){

var temp = arr2[j];

arr2[j] = arr2[j+1];

arr2[j+1] = temp;

}

}

}