手写js中的bind
JS 手写 bind
2023-09-14 09:07:43 时间
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
</head>
<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>
</body>
</html>