ECMA6Script中的[] .forEach.call(...)的替代方法 [英] Alternative for [].forEach.call(...) in ECMA6Script
问题描述
var elements = document.querySelectorAll(' DIV');
[] .forEach.call(elements,function(element){
div.style.color ='green';
});
此代码可以工作,但是 []。forEach.call(... )
在大型应用中不容易阅读。在ECMA6Script中,是否有一种本机方式,可以在不使用定制功能或原型的情况下更轻松地进行DOM枚举?
ES6中的任何更多的 forEach
。您可以使用 for for
loop :
for(let div of document.querySelectorAll 'div'))
div.style.color ='green';
除此之外,您可以使用 Array.from
来投射一个可迭代对象到数组,然后调用 .forEach
;但事实上,即将到来的DOM规范这是不必要的,其中 querySelectorAll
将返回一个元素
集合,它继承自 Array
以ES6的方式 - 所以你可以直接调用 .forEach
方法!
I use the following code in all my applications to enumerate through DOM elements:
var elements = document.querySelectorAll('div');
[].forEach.call(elements, function(element) {
div.style.color = 'green';
});
This code works, however [].forEach.call(...)
is not easy to read in large applications. Is there a native way for easier DOM enumeration in ECMA6Script without using custom-made functions or prototypes?
You wouldn't use forEach
at all any more in ES6. You'd use a for of
loop:
for (let div of document.querySelectorAll('div'))
div.style.color = 'green';
Apart from that, you can use Array.from
to cast an iterable object to an array and then invoke .forEach
on that; but in fact with the upcoming DOM spec this is unnecessary where querySelectorAll
will return an Elements
collection that does inherit from Array
in the ES6 way - so you can call the .forEach
method directly on it!
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