ziyunfei · July 4, 2014 08:21 · ericdum · Jul 4, 2014
diff --git a/@@unscopables.js b/@@unscopables.js
 var x = 1, y = 2, obj = {x:3, y:4}
 with(obj) {
    console.log(x, y) // 3, 4
    obj[Symbol.unscopables] = {
        x: true,
        y: true
    }
    console.log(x, y) // 1, 2
 }
	var x = 1, y = 2, obj = {x:3, y:4}
	with(obj) {
	console.log(x, y) // 3, 4
	obj[Symbol.unscopables] = {
	x: true,
	y: true
	}
	console.log(x, y) // 1, 2
	}