从Vue源码中我学到了几点精妙方法

(function (a, b) {
 console.log(a, b); // 1,2
 })(1, 2);

(function (global) {
 console.log(global); // Window对象
 })(this);

var a = 1;
 var b = 0;
 a == 1 ? (b == 2 ? (b = 3) : (b = 1)) : “”;
 console.log(b); // 1

var emptyObject = Object.freeze({
 key: “1”,
 });
 emptyObject.name = “maomin”;
 delete emptyObject.key;
 emptyObject.key = “2”;
 console.log(emptyObject);

var sealObject = Object.seal({
 key: 3,
 });