jsbase/a.function.html at master · xiongchenf/jsbase · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
</head>
<body>
	<script>
		// foo();
		// var a = true;
		// if (a) {
		// 	function foo() {
		// 		console.log('a')
		// 	}
		// } else {
		// 	console.log('b');
		// }

		// function foo() {
		// 	var a = 0;
		// 	function b() { console.log('b'); }
		// }

		// foo();

		// b();

		function mNew() {
			var obj = Object.create(null),

			Constructor = [].shift.call(arguments);

			obj.__proto__ = Constructor.prototype;

			console.log(arguments);

			var res = Constructor.apply(obj, arguments);

			return typeof res === 'object' ? res : obj;
		}

		Function.prototype.apply2 = function(ctx, args) {
			var arr = [],
			ctx = ctx || window;
			ctx.fn = this;

			for (var i = 0, l = args.length; i++) {
				arr.push("args["+ i +"]");
			}
			arr = arr.join(',');
			var res = eval("ctx.fn("+ arr +")");

			delete ctx.fn;
			return res;
		}

		function Person(name) {
			this.name = name;
		}

		var p1 = mNew(Person, 'bear');

		console.log(p1);
	</script>
</body>
</html>