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<title>Document</title>
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<body>
<script>
// 手写实现 bind
Function.prototype.bind =
// Function.prototype.bind ||
function (context) {
let args1 = Array.prototype.slice.call(arguments, 1);
let self = this;
return function () {
let args2 = Array.prototype.slice.call(arguments);
console.log([...args1, ...args2]);
return self.apply(context, [...args1, ...args2]);
};
};
var name = "xiaoming";
let obj = {
name: "xiaohong",
getName: function () {
console.log(this.name);
},
};
obj.getName(); // xiaohong
let getName1 = obj.getName;
getName1(); // xiaoming
let getName2 = obj.getName.bind(obj);
getName2(); // xiaohong
let getName3 = obj.getName.bind(obj)(); // xiaohong
let getName4 = obj.getName.bind(obj, 111)(); // [111] xiaohong
let getName5 = obj.getName.bind(obj, 111, 222)(); // [111, 222] iaohong
let getName6 = obj.getName.bind(obj, 111, 222)(333); // [111, 222, 333] xiaohong
obj.getName.call(obj); // xiaohong
</script>
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