call方法
function info(name
, age
) {
this.name
= name
;
this.age
= age
;
}
function people(name
, age
, work
) {
info
.call(this, name
, age
);
console
.log("他叫" + this.name
+ "," + this.age
+ "岁,职业是" + work
)
}
people("Li", 21, "IT");
apply方法
function info(name
, age
) {
this.name
= name
;
this.age
= age
;
}
function people(name
, age
, work
) {
info
.apply(this, [name
, age
]);
console
.log("他叫" + this.name
+ "," + this.age
+ "岁,职业是" + work
)
}
people("Zhang", 22, "IT");
bind方法 不带参使用
let info
= {
name
: "Wang"
}
function people() {
console
.log("他叫" + this.name
)
}
let func
= people
.bind(info
);
func();
bind方法 带参数使用
let info
= {
name
: "Wang"
}
function people(m
, n
, o
) {
console
.log(m
, n
, o
)
}
let func
= people
.bind(null, '11');;
func("22", "33", "44");
相同点
1.都能改变this指向
不同点
1.bind 调用执行 call apply立即执行
2.call, bind 依次传入 apply 数组传入
