高级vue教程 源码分析

 function convert(obj) {
      Object.keys(obj).forEach(key => {
        let internalValue = obj[key]
        Object.defineProperty(obj, key, {
          get() {
            console.log(`getting key "${key}": ${internalValue}`)
            return internalValue
          },
          set(newValue) {
            console.log(`setting key "${key}" to: ${newValue}`)
            internalValue = newValue
          }
        })
      })
    }

let student = {
      name: "liuyi",
      age: 12,
      sex: "female"
    }

    convert(student)
    Object.keys(student).forEach(key => {
      console.log("student.key", student[key]);
    })

    console.log("student.name", student.name);
    console.log("student.age", student.age);
    student.name = "xiaowang";
    student.age = student.age + 1;
    console.log("student.name", student.name);