摘要：
//题目一if (!("a" in window)) { var a = 1;}console.log("题目一的答案:",a);//题目二var a = 1, b = function a(x) { x && a(--x); };console.log("题目二的答案:",a);//题目三function c(x) { return x * 2;}var c;console.log("题目三的答案:",c);//题目四function d(x, y, d) { arguments[2] = 10; 阅读全文
