crongro · April 2, 2017 07:47
diff --git a/es6_weakSet.js b/es6_weakSet.js
 let ws = new WeakSet();
 let a = [1,2,3];

 ws.add(a);
 console.log(ws.has(a));  //true

 a = null;
 console.log(ws.has(a));  //false
	let ws = new WeakSet();
	let a = [1,2,3];

	ws.add(a);
	console.log(ws.has(a)); //true

	a = null;
	console.log(ws.has(a)); //false