JavaScript Math Object Math Object The Math object allows you to perform mathematical tasks. Math is not a constructor. All properties/methods of Math can be called by using Math as an object, without creating it. Syntax var x = Math.PI; // Returns P
javascript nested object merge deep copy Object reference type function namespace(oNamespace, sPackage) { // deep copy let res = oNamespace; const arr = sPackage.split("."); // ["a", "b", "c", "d"] const
创建Object的方式有两种: 第一种:使用new操作符后跟Object操作函数. var person = new Object(); person.name = "wang"; person.age = 18: 第二种:使用对象字面量表示法.(在最后的一个属性后面加逗号会在IE7及更早的Opera中导致错误) var person = { name = "wang", age = 18 } 一般在访问对象属性的时候,使用的都是点表示法,但是在JavaScript