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interview's Introduction

//一 var a = 1; (function(){ console.log(a); var a = 2; })();

/* undefined */

//二 function a(){ return 1; } (function(){ console.log(a()); function a(){ return 2; } })();

/* 2 */

//三 var o = { a : 1, b : function(){ setTimeout(function(){ console.log(this.a); }, 0); console.log(2); } }; o.b();

/* 2 undefined */

//四 把字符串'a=1&b=2&c=3'解析成 {a:1,b:2,c:3}

/* var o = {}; 'a=1&b=2&c=3'.split('&').map(function(i){ var r = i.split('='); o[r[0]] = r[1]; }); */

//五 实现一个add方法,使add(2)(3)()结果为5; /* if (arguments.length){ return add(num + x); } else { return num; } / / function add(num){ return function(x){ return arguments.length ? add(num + x) : num; } } */

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