为什么我看到使用string.split（）创建的javascript数组？

Question

I see code like this all over the web

var days= "Monday Tuesday Wednesday Thursday Friday Saturday Sunday".split(" ");

Why do that instead of

var days = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"];

I don't think laziness or ignorance has anything to do with it. This is out of jQuery 1.4.2

props: "altKey attrChange attrName bubbles button cancelable charCode clientX clientY ctrlKey currentTarget data detail eventPhase fromElement handler keyCode layerX layerY metaKey newValue offsetX offsetY originalTarget pageX pageY prevValue relatedNode relatedTarget screenX screenY shiftKey srcElement target toElement view wheelDelta which".split(" ")

They do it all over the place.

Answer 1

I think it's because you don't have to quote and separate every string of the array. Likewise, in perl, many people use qw(abcdefg) instead of ('a', 'b', 'c', 'd', 'e', 'f', 'g') . So the benefit is twofold:

1. It's faster and easier to write and modify (can obviously be debatted).
2. It's smaller bitwise, so you spare some bandwidth.

See the bit size:

var days= "Monday Tuesday Wednesday Thursday Friday Saturday Sunday".split(" ");
// 81 characters

vs

var days = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"];
// 91 characters

Answer 2

如果初始字符串在文本中有引号或双引号也可能有意义。

Answer 3

"81 characters and 91 characters" << Nice observation but it again adds few processing time to convert String to Array and what if sometimes there's need to add something which has 2 words in it.

May be they like this coding style.

IDK

Answer 4

您可以在20种语言中使用20个字符串的工作日名称，并使用单个拆分为用户返回正确的数组。