使用 JavaScript 在每个第 n 个位置拆分一个字符串？
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Split a string, at every nth position, with JavaScript?
提问by Lucas
I have the following string:
我有以下字符串：
foofaafoofaafoofaafoofaafoofaa
An array with 10 rows (if I split by every 3rd character, that is), which looks something like this, if I were to instantiate it:
一个有 10 行的数组（如果我按每个第三个字符分割），它看起来像这样，如果我要实例化它：
var fooarray = new Array ('foo', 'faa', 'foo', 'faa', 'foo', 'faa', 'foo', 'faa', 'foo', 'faa');
So I want a function, either built-in or custom-made, which can help me split up a string by every nth character.
所以我想要一个函数，无论是内置的还是定制的，它可以帮助我按每个第 n 个字符拆分一个字符串。
回答by xdazz
Try the below code:
试试下面的代码：
var foo = "foofaafoofaafoofaafoofaafoofaa";
console.log( foo.match(/.{1,3}/g) );For nth position:
对于第 n 个位置：
foo.match(new RegExp('.{1,' + n + '}', 'g'));
回答by sp00m
var s = "foofaafoofaafoofaafoofaafoofaa";
var a = [];
var i = 3;
do{ a.push(s.substring(0, i)) }
while( (s = s.substring(i, s.length)) != "" );
console.log( a )Prints:
印刷：
foo,faa,foo,faa,foo,faa,foo,faa,foo,faa
Working demo: http://jsfiddle.net/9RXTW/
工作演示：http: //jsfiddle.net/9RXTW/
回答by freefaller
As I was writing this, @xdazz came up with the wonderfully simple regex solution.
在我写这篇文章的时候，@xdazz 想出了一个非常简单的正则表达式解决方案。
As you have asked (om the comments to that answer) for a non-regex solution, I will submit this anyway...
正如您所要求的（对该答案的评论）非正则表达式解决方案，无论如何我都会提交...
function splitNChars(txt, num) {
var result = [];
for (var i = 0; i < txt.length; i += num) {
result.push(txt.substr(i, num));
}
return result;
}
splitNChars("foofaafoofaafoofaafoofaafoofaa",3);
回答by Guffa
You can do like this:
你可以这样做：
var input = "foofaafoofaafoofaafoofaafoofaa";
var result = [];
while (input.length) {
result.push(input.substr(0, 3));
input = input.substr(3);
}
回答by Lucas
As Mark Walter has pointed out, this solution from another Stack Overflow questionworks perfectly:
正如 Mark Walter 所指出的，这个来自另一个 Stack Overflow 问题的解决方案非常有效：
function splitStringAtInterval (string, interval) {
var result = [];
for (var i=0; i<string.length; i+=interval)
result.push(string.substring (i, i+interval));
return result;
}
回答by sarahg
The function followed by an example using it. The example test outputs: ["abc","def","ghi","j"]
该函数后面是一个使用它的例子。示例测试输出：["abc","def","ghi","j"]
function splitEvery(str, n)
{
var arr = new Array;
for (var i = 0; i < str.length; i += n)
{
arr.push(str.substr(i, n));
}
return arr;
}
var result = splitEvery('abcdefghij', 3);
document.write(JSON.stringify(result));
