1. Determine the node name
1.getElementById
2.getElementsByTagName
3.getElementsByClassName
4.querySelector
2. Obtain information under the node name
var 字段名 = document.getElementsByClassName("节点名" );
例如：
var arr = document.getElementsByClassName("a");
console.log(arr);//打印输出The results displayed on the f12 console
3. Intercept the obtained information
var Shop_info = arr[1].outerText;//获取数组里第二项的outerText的值
console.log(Shop_info)//输出的内容为xxx\nID:123456
var arr1 = Shop_info.split("\nID:");//截取\nID:前后的值
var Shop_Name = arr1[0];//第一个值为： xxx
var Shop_Id = arr1[1];//第二个值为： 123456
console.log(Shop_Id)
console.log(Shop_Name)
