前端学习笔记202310学习笔记第一百零玖天-vue3-链式调用&对象属性与遍历&this指向&caller_callee之13

var geyao={
    name:"geyao",
    age:18
}
console.log('age' in geyao) //true

function Car(){
    this.brand='TAGE',
    this.color='red'
}
Car.prototype={
    displacement:'3.0'
}
var car=new Car();
console.log('displacement' in car)

运行结果