text: let {
      observable,
      observe,
      raw
    } = require("../index");
  //   } = require("../../../dist/cjs.es5");
    
    let arr = observable([
        {
            name: "张三"
        },
        {
            name: "李四",
            friend: {
                name: "赵六"
            }
        }
    ]);
    
    
    let reaction = observe(() => {
      console.log("[reaction]", arr[1].friend.name);
    });
  
  
  // emit once
  arr[1].friend.name = "有鱼";