来自:http://julying.com/blog/so-you-think-you-know-javascript/ 题目一: if (!("a" in window)) { var a = 1; } alert(a); 题目二: var a = 1, b = function&…
来自:http://julying.com/blog/so-you-think-you-know-javascript/ 题目一: if (!("a" in window)) { var a = 1; } alert(a); 题目二: var a = 1, b = function&…