为document.querySelectorAll创建一个简短的别名 [英] Making a short alias for document.querySelectorAll

问题描述

我将运行document.querySelectorAll（）很多，并且想要一个简写别名。

I'm going to be running document.querySelectorAll() a whole lot, and would like a shorthand alias for it.

var queryAll = document.querySelectorAll

queryAll('body')
TypeError: Illegal invocation

不起作用。鉴于：

document.querySelectorAll('body')

仍然如此。如何使别名起作用？

Still does. How can I make the alias work?

推荐答案

这似乎有效：

var queryAll = document.querySelectorAll.bind(document);

bind 返回对<$的引用c $ c> querySelectorAll 函数，将querySelectorAll方法中'this'的上下文更改为文档对象。

bind returns a reference to the querySelectorAll function, changing the context of 'this' inside the querySelectorAll method to be the document object.

绑定函数是仅在IE9 +（以及所有其他浏览器）中受支持 - https ：//developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Function/bind

The bind function is only supported in IE9+ (and all the other browsers) - https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Function/bind

更新：实际上，您可以创建一系列文档方法的快捷方式，如下所示：

Update: In fact you could create shortcuts to a whole range of document methods like this:

var query = document.querySelector.bind(document);
var queryAll = document.querySelectorAll.bind(document);
var fromId = document.getElementById.bind(document);
var fromClass = document.getElementsByClassName.bind(document);
var fromTag = document.getElementsByTagName.bind(document);

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