CallExpression和MemberExpression之间的区别 [英] Difference between CallExpression and MemberExpression

问题描述

有什么区别？我查看了ECMAScript规范，但不明白。真正有用的代码示例。

What is the difference? I looked at the ECMAScript specification, but did not understand. The real code examples that would help much.

如果你能在这里解释每一行就会很好

If you can explain every line here it would be nice

MemberExpression : 
 PrimaryExpression 
 FunctionExpression
 MemberExpression [ Expression ] 
 MemberExpression . IdentifierName 

CallExpression : 
 MemberExpression Arguments
 CallExpression Arguments 
 CallExpression [ Expression ] 
 CallExpression . IdentifierName

例如

console.log - MemberExpression: MemberExpression . IdentifierName
console.log("hi") - CallExpression : MemberExpression Arguments

什么是遗嘱相等

CallExpression : CallExpression . IdentifierName
CallExpression [ Expression ]
CallExpression : CallExpression Arguments 

ES的链接< a href =http://www.ecma-international.org/ecma-262/5.1/#sec-11.2 =nofollow noreferrer> http://www.ecma-international.org/ecma-262/ 5.1 /＃sec-11.2

推荐答案

此处的相关部分是

NewExpression:
    MemberExpression
    new NewExpression
LeftHandSideExpression:
    NewExpression
    CallExpression

区分三个主要的左手边表达式：

which distinguishes the three major left hand side expressions:

• 构造函数调用


• 函数/方法调用


• 主要表达式

所有这些成员访问在正确的位置。因此，您列出的产品之间的差异只是 CallExpression 总是包含一个调用 - 因此可能不是之后的表达式的一部分新的运营商。

And all of them with member accesses in the right places. As such, the difference between the productions you listed is just that a CallExpression always contains a call - and may therefore not be part of the expression after a newoperator.

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