1.字符串转化成数组：split---[分离]
var s = 'Hello world';
s.split();
>>>["Hello world"]
- slice()可用于复制一个字符串或数组---[切片]
var s = 'Hello world';
s.slice();
>>>"Hello world"
var arr = [1,2,3];
arr.slice();
>>>(3) [1, 2, 3]
2.split()方法细节
var s = 'y';
s.split('y');
>>>(2) ["", ""]
3.实例属性无法修改原型对象中的属性
function Person(){}
Person.prototype.name = 'Gerg';
var person1 = new Person();
person1.name;
>>>"Gerg"
Person.prototype.name = 'asan';
person1.name;
>>>"asan"
person1.prototype;
>>>undefined
4.如何仅获取原型对象中的属性？
function Person(){}
Person.prototype.name = 'Gerg';
Person.prototype.age = 21;
Person.prototype.job = 'Student';
Person.prototype.sayName = function(){
console.log(this.name);
};
var person1 = new Person();
person1.city = 'Shanghai';
function getPurePrototypeProperty(o){
for(var i in o){
if(!o.hasOwnProperty(i) && (i in o)){
console.log(i);
}
}
}
getPurePrototypeProperty(person1);
原型对象属性.png
