Thefunctionstatement declares a function. A declared function is "saved for later use", and will be executed later, when it is invoked (called). In JavaScript, functions are objects, and they have both properties and methods. A function can also be defined using an expression (SeeFunction De...
The JavaScript exception "function statement requires a name" occurs when there is afunction statementin the code that requires a name. Message SyntaxError: Function statements require a function name (V8-based) SyntaxError: function statement requires a name (Firefox) SyntaxError: Function statements ...
While the function declaration above is syntactically a statement, functions can also be created by afunction expression. Such a function can beanonymous; it does not have to have a name. 定义function还有另外一种写法,叫做函数表达式。这样的function可以是匿名的。没有必要非写一个名字给function。如下...
There are two differences from the full definition, it omits the curly brackets and thereturnstatement. The shortened version carries out the return automatically. It means that there is exactly one computable expression inside such a function, and its result will be immediately returned. Note that...
Afunction declarationis a statement. It can therefore only appear in statement position. This means that if you see a function definition in a place where only expressions are allowed, you're not looking at a function declaration, but a function expression. ...
代码语言:javascript 复制 function* logGenerator() { console.log(yield); console.log(yield); console.log(yield); } var gen = logGenerator(); // the first call of next executes from the start of the function // until the first yield statement gen.next(); gen.next('pretzel'); // pre...
In ECMAScript there are three function types and each of them has its own features. 在ECMAScript中,有三种不同的函数类型,并且他们都有自己的特点。 函数声明 AFunction Declaration (abbreviated form is FD)is a function which: 函数声明(简写FD)是这样的一个函数 ...
Functions stored in variables do not need function names. They are always invoked (called) using the variable name. The function above ends with a semicolon because it is a part of an executable statement. The Function() Constructor As you have seen in the previous examples, JavaScript functi...
If you're interested in the language grammar, the syntax and semantics of theEmptyStatementare described inSection 13.4of the specification. You can easily verify how the program is parsed by running the code through a JavaScript parser such asEsprima. Entering theidentityfunction into Esprima'sonl...
Working of a Function in JavaScript Here,When the greet() function is called, the program's control transfers to the function definition. All the code inside the function is executed (Hello World! is printed). The program control then jumps to the next statement after the function call (...