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 = 'Rect
Functions Used as Variable Values Functions can be used the same way as you use variables, in all types of formulas, assignments, and calculations. Example Instead of using a variable to store the return value of a function: letx = toCelsius(77); ...
// 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....
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 , 代码语言:javascript 代码运行次数:0 运行 AI代码解释 // 变量名不能是关键字varvar="Tom"; 直接报如下错误信息 : 代码语言:javascript 代码运行次数:0 运行 AI代码...
在源码中的位置:要么处于程序级(Program level),要么处于其它函数的主体(FunctionBody)中 在进入上下文阶段创建 影响变量对象 以下面的方式声明 functionexampleFunc() { ... } The main feature of this type of functions is thatonly they influence variable object(they are stored in the VO of the context...
A JavaScript function can also be defined using anexpression. A function expression can be stored in a variable: Example varx =function(a, b) {return a * b}; Try it Yourself » After a function expression has been stored in a variable, the variable can be used as a function: ...
As you can see, the function's name doesn't get hoisted if it is part of a function expression.And that is how variable and function hoisting works in JavaScript.Thanks for reading!Joshua ClantonWant to improve your JavaScript skills? Subscribe to A Drip of JavaScript for biweekly tips to...
A JavaScript function can also be defined using anexpression. A function expression can be stored in a variable: Example constx =function(a, b) {returna * b}; Try it Yourself » After a function expression has been stored in a variable, the variable can be used as a function: ...
In the above example, we passed "John" as an argument to the greet() function. Pass Argument to the Function Notice the name variable declared inside parentheses: function greet(name) { // code } Here, name is a function parameter, which acts as a placeholder to store the function argu...
functionaddNumbers(){varsum =5+4; } Here, thesumvariable is created inside theaddNumbers()function. So, it's accessible only within that function (local or function scope). This kind of variable is known as alocal variable. Note:Based on the scope they're declared in, variables can be...