apply.html

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<script type="text/javascript">
			Function.prototype.myApply=function(context){
				var context=context||window, result;
				console.log(this)
				context.fn=this;
				if(arguments[1]){
					result=context.fn(...arguments[1])
				} else {
					result=context.fn()
				}
				delete context.fn
				return result
			}
			var clickApply=function(a,b){
				console.log('我是apply', this, a, b)
			}
			let a={
				name: '我是陈皮'
			}
			clickApply.myApply(a,['chen','peng'])
			Function.prototype.myApply=function(context){
				let context=context||window;
				context.fn=this;
				if(arguments[1]){
					let result=context.fn(...arguments[1])
				}else {
					let result=context.fn()
				}
				delete context.fn
				return result
			}
		</script>
	</body>
</html>