function declaration
函数声明
一个函数声明
一个functiondeclaration the function declares
函数声明 定义了一个命名的函数变量,而不需要变量赋值。A Function Declaration defines a named function variable without requiring variable assignment. It cannot be used on function declarations or definitions. If you remember the syntax of a function declaration :. Both function declarations and variable declarations are hoisted. Combinations with other parts of speech
Function declaration , however, loads before any code is executed.The environment record is the actual place where the variable and function declarations are stored. 函数声明 非常容易(经常是意外地)转换为函数表达式。A function declaration is very easily and often unintentionally turned into a function expression. For the above defined function max(), following is the function declaration :. The void keyword is used only in function declarations . For the above defined function max(), following is the function declaration -. The void keyword is used only in function declarations . The environment record is the actual place where the variable and function declarations are stored. The environment record is the actual place where the variable and function declarations are stored. However, with a function declaration the entire function is processed in advance of any code execution. What is meant with“const” at end of function declaration ? As the trailing return type of a function declaration ; 在ES6之前,这两个函数声明 都会被提升,结果就是‘Ididn/'tpass',不管something是什么东西。 Before ES6, both function declarations would have been hoisted and the result would have been'I didn't pass' no matter what something was. 正如我们之前提到的,所有的变量和函数声明 被提升到它们的作用域的顶部。 All variable and function declarations get hoisted to the top of their scope. 我们可以说『好吧,让其变成函数声明 ,让我们增加一个名称』,但它是没有效果的。 We can say“okay, let it be so Function Declaration , let's add a name”, but it won't work. 请注意:箭头函数和函数声明 /表达式不是等效的,不能盲目替换。 Be aware: Arrow functions and function declarations / expressions are not equivalent and cannot be replaced blindly. 一个函数定义(也称为函数声明 ,或函数语句)由一系列的function关键字组成,依次为:. A function definition(also called a function declaration , or function statement) consists of the function keyword, followed by:. 函数声明 中不允许包含参数列表,这样编译器就无法在此时检查power函数调用的合法性。Parameter lists are not allowed in function declarations , so the compiler cannot check the validity of a power function call at this time. 一个函数定义(也称为函数声明 ,或函数语句)由一系列的function关键字组成,依次为:. A function definition(also called a function declaration ) consists of the function keyword, followed by. 在函数声明 中,参数的名称并不重要,只有参数的类型是必需的,因此下面也是有效的声明:. Parameter names are not important in function declaration only their type is required, so the following is also a valid declaration-. . 函数声明 和变量声明总是被JavaScript解释器无形中移动到(提升)包含他们的作用域顶部。Function declarations and variable declarations are always hoisted invisibly to the top of their containing scope by the JavaScript interpreter. But a Function Declaration must have a name, so there will be an error:. 函数声明 和变量声明总是隐式地被JavaScript解释器移到其包含的作用域顶部。Function declarations and variable declarations are always hoisted invisibly to the top of their containing scope by the JavaScript interpreter.
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