JavaScriptのfor inとfor ofの違い
2902 ワード
重点の内容 eg、
1.巡回行列:
for in key; for of value
for of ,for in
1.巡回行列:
let array = [1,2,3,'lynn','Lanny']
console.log('for of: ')
for (let value of array){
console.log(value);
}
console.log('
'+'for in: ')
for (let key in array){
console.log(key);
}
コンソール印刷for of:
1
2
3
lynn
Lanny
for in:
0
1
2
3
4
1.オブジェクトを巡回:function Person(){
this.name = 'Lanny';
this.age = '24';
this.sleep = ()=>{
console.log('I am sleeping~~~~');
}
}
Person.prototype.sayHello = (name)=>{
console.log('hello ' + name);
}
let person = new Person();
person.sayHello('Lynn');
for(let key in person){
if(person.hasOwnProperty(key)){ //
console.log(key);
}
}
コンソール印刷:hello Lynn
name
age
sleep