javascript - javascript函数中void this的目的是什么

Question

javascript函数end中void this的作用是什么

words = ''; wordless=' ';

function say_it(word) {
     return word ? smothered_mouthfuls(word) : end();
}

function smothered_mouthfuls(word) {
    word = words ? wordless + word : word;
    words = words + word;
    return say_it;
 }

 function end() {
     return  void this,words;
 }

任何人都知道无效目的，谢谢。

Answer 1

您拥有的是 voidoperator

The void operator evaluates the given expression and then returns undefined.

与 comma operator 结合使用

The comma operator evaluates each of its operands (from left to right) and returns the value of the last operand.

return void this, words;

像这样工作

return (void this, words); // return words

实际上，对于代码来说，它看起来像是噪音，没有 this 表达式的任何意义。

如果 this 的调用调用了某些东西，那么它是必要的，否则它看起来像代码味道，其中某些代码正在执行某些没有明确提及的操作。

var words = '', wordless=' ';

function say_it(word) {
    return word ? smothered_mouthfuls(word) : end();
}

function smothered_mouthfuls(word) {
    word = words ? wordless + word : word;
    words = words + word;
    return say_it;
}

function end() {
    void this;     // or not
    return  words;
}
   
console.log(say_it('foo')());
console.log(say_it('bar')());
console.log(say_it('baz')());