function intheritProto(son, fa) {
const proto = Object.create(fa.prototype)
proto.constructor = son
son.prototype = proto
}
function fa(name) {
this.name = name
}
fa.prototype.intro = function () {
console.log('fa', this.name);
}
function son(name, age) {
fa.call(this, name)
this.age = age
}
intheritProto(son, fa)
son.prototype.intro = function () {
console.log('son', this.name, this.age);
}
var son1 = new son('wenhao', '21')
var fa1 = new fa('haha')
