static variable and static function 静态变量和静态方法,不用实例化类可以直接访问的类变量和类方法,一般时工具函数。 class Rectangle{ constructor(width, height){ this.width = width; this.height = height; } static displayName = 'Rectangle'; static getArea(){ return this.width * this.height; } ...
// 变量名严格区分大小写varname="Tom";varName="Jerry";console.log("name : "+name+" , Name : "+Name); 浏览器控制台输出结果如下 : 4、变量不能是 关键字 JavaScript 变量名 不能是 JavaScript 语言 的 保留字 或 关键字 , 如var、function、let、const等关键字 ; 下面 使用var关键字作为变量名...
// Global variable referenced by following function. // If we had another function that used this name, now it'd be an array and it could break it. var name = 'Ryan McDermott'; function splitIntoFirstAndLastName() { name = name.split(' '); } splitIntoFirstAndLastName(); console....
Because both function1 and function2 depend on the global variable global, running these functions in parallel causes undesirable effects. Now change these functions into a pure function as explained in Listing 1-11.let function1 = (input,global) => { // works on input //changes global globa...
functionname(parameter1, parameter2, parameter3) { //code to be executed } Functionparametersare listed inside the parentheses () in the function definition. Functionargumentsare thevaluesreceived by the function when it is invoked. Inside the function, the arguments (the parameters) behave as loc...
var $name = "Tom"; 1. 2. 3. 4. 数字 不能 作为 变量名 的开头 An identifier or keyword cannot immediately follow a numeric literal.javascript 1. 代码示例 : <!DOCTYPE html> <!-- 设置 meta 视口标签 --> JavaScript<
constx =function(a, b) {returna * b}; Try it Yourself » When a function is stored in a variable, the variable can be used as a function: constx =function(a, b) {returna * b}; letz = x(4,3); Try it Yourself » ...
After a function expression has been stored in a variable, the variable can be used as a function: Example varx =function(a, b) {return a * b}; varz = x(4,3); Try it Yourself » The function above is actually ananonymous function(a function without a name). ...
var MyClass =function(){ var _buffer; this.doSomething=function(){ };} 9.变量如果设置为私有，则前面 必须 添加下划线。this._somePrivateVariable = statement;10.通用的变量 必须 使用与其名字一致的类型名称：setTopic(topic)// 变量 topic 为 Topic 类型的变量 11.所有的变量名 ...
_getName(me.firstName, me.lastName); console.log(name); // "Robin Wieruch" A private variable/function can occur in a JavaScript file as well. This could mean that the variable/function shouldn't be used outside of this file but only internally to compute further business logic for ...