Function.prototype.mycall = function (context) {
let fn = Symbol()
context = context || window
context[fn] = this
let arg = [...arguments].slice(1)
context[fn](...arg)
}
Function.prototype.myApply = function (context) {
let fn = Symbol()
context = context || window
context[fn] = this
let arg = [...arguments].slice(1)
context[fn](arg)
}
Function.prototype.binds = function (context) {
let self = this
let arg = [...arguments].slice(1)
return function () {
let newArg = [...arguments]
return self.apply(context, arg.concat(newArg))
}
}
let Person = {
name: 'Tom',
say(age, g) {
console.log(`我叫${this.name}我今年${age}++++${g}`)
}
}
Person1 = {
name: 'Tom1'
}
Person.say.mycall(Person1, 20000, 222, 445)//我叫Tom1我今年18
Person.say.myApply(Person1, [20000, 222, 445])//我叫Tom1我今年18
let fn = Person.say.binds(Person1, 20000, 222, 445)
fn()
