javascript 赋值对象相同属性的值

README01.md

浅拷贝

// 浅拷贝
let q10Viking = {
	name: null,
    school: null
}

let hzz = {
	name: "Q10Viking",
    school: 'CAU'
}

console.log(q10Viking,hzz)
let res = Object.assign(q10Viking,hzz)
console.log(res,q10Viking)
// 改变值
q10Viking.school="CIEE"
console.log(res,q10Viking)

/**

{name: null, school: null} {name: "Q10Viking", school: "CAU"}
VM190:14 {name: "Q10Viking", school: "CAU"} {name: "Q10Viking", school: "CAU"}
VM190:17 {name: "Q10Viking", school: "CIEE"} {name: "Q10Viking", school: "CIEE"}

*/

test02.md

深拷贝

• 也不一定如果属性值为对象的话

// 深拷贝

let arra = {
	school: '',
    name: '',
    age: ''
}
let arrb = {
 	school: 'CAU',
    name: 'Q10Viking',
}

Object.keys(arra).forEach(key=>{
	arra[key] = arrb[key] || arra[key]
})
console.log(arra)
arra.name="hzz"
console.log(arra,arrb)

/**

{school: "CAU", name: "Q10Viking", age: ""} {school: "CAU", name: "Q10Viking"}
VM353:17 {school: "CAU", name: "hzz", age: ""} {school: "CAU", name: "Q10Viking"}

*/

虽然key的赋值上面写很简单，但是如何要赋值的是零，这不会赋值成功，因为零为false, 过滤0

      Object.keys(this.modifyDialogData).forEach(key => {
        if (!(!val[key] && val[key] !== 0)) {
          this.modifyDialogData[key] = val[key]
        }
      })