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js小案例歌词匹配

简单实现apply/call/bind

js原型与原型链

1、for in 万能循环判断var obj = {};var b = function () { for(var key in obj){ reture false; } return true;}alert(b()); //true 2、将json对象转化为json字符串，在判断该字符串是否是“{}”var data = {}var b = (JSON.stringify(data) == "{}");alert(b);// true 3、使用ES6的object.k

1、if多条件判断// 冗余if (x === 'abc' || x === 'def' || x === 'ghi' || x ==='jkl') {}// 简洁if (['abc', 'def', 'ghi', 'jkl'].includes(x)) {}2、if……else……// 冗余let test: boolean;if (x > 100) { test = true;} else { test = false;}// 简洁let test =