【工具函数】apply
<h5>模拟apply的功能</h5>
<hr />
<p>改变this的指向</p>
<pre><code class="language-javascript">/**
* @description myApply 模拟apply
* @param {object} obj 对象
* 给对象中添加方法然后，删除这个对象中的方法
*/
Function.prototype.myApply = function(obj){
var obj = obj || window;
obj.fn = this;
var args = arguments[1];
var result;
if(args){
result = obj.fn(...args)
}else{
result = obj.fn()
}
delete obj.fn
return result
}
let a = {
value: 1
}
function getValue(name, age) {
console.log(name)
console.log(age)
console.log(this.value)
}
getValue.myApply(a, ['yck', '24']) //两者执行效果一样
getValue.myApply(a, ['yck', '24'])
console.log(a)</code></pre>
<p>参考链接：<a href="https://yuchengkai.cn/docs/frontend/#%E6%A8%A1%E6%8B%9F%E5%AE%9E%E7%8E%B0-call-%E5%92%8C-apply">https://yuchengkai.cn/docs/frontend/#%E6%A8%A1%E6%8B%9F%E5%AE%9E%E7%8E%B0-call-%E5%92%8C-apply</a></p>