javascript 从Javascript中的逗号分隔值中获取字符串的第一个和其余部分

Get first and rest of string from comma separated values in Javascript

提问by Hommer Smith

Given a string like this:

给定一个这样的字符串：

"boy, girl, dog, cat"

What would be a good way to get the first word and the rest of them, so I could have this:

获得第一个单词和其余单词的好方法是什么，所以我可以这样：

var first_word = "boy";
var rest = "girl, dog, cat";

Right now I have this:

现在我有这个：

my_string.split(",");But that gives me all the words that are between the commas.

my_string.split(",");但这给了我逗号之间的所有单词。

采纳答案by Zeta

You can use both splitand splice:

您可以同时使用split和splice：

var str = "boy, girl, dog, cat";
var arr = str.split(",");
var fst = arr.splice(0,1).join("");
var rest = arr.join(",");

Or similar

或类似的

// returns an array with the extracted str as first value
// and the rest as second value
function cutFirst(str,token){
   var arr = str.split(token);
   var fst = arr.splice(0,1);
   return [fst.join(""),arr.join(token)];
}

回答by FixMaker

You can use a regex to match the two strings before and after the first comma:

您可以使用正则表达式来匹配第一个逗号前后的两个字符串：

var v = "boy, girl, dog, cat";
var strings = v.match(/([^,]*),(.*)/);

Now stringswill be a three element array where

现在strings将是一个三元素数组，其中

• strings[0]contains the full string
• strings[1]contains the string before the first comma
• strings[2]contains everything after the first comma

• strings[0]包含完整的字符串
• strings[1]包含第一个逗号前的字符串
• strings[2]包含第一个逗号之后的所有内容

回答by Sirko

Use a combination of substring()(returning the substring between two indexes or the end of the string) and indexOf()(returning the first position of a substring within another string):

使用substring()（返回两个索引之间或字符串末尾的子字符串）和indexOf()（返回另一个字符串中子字符串的第一个位置）的组合：

var input = "boy, girl, dog, cat",
    pos = input.indexOf( ',' );

console.log( input.substring( 0, pos ) );
console.log( input.substring( pos + 1 ) );

Maybe you want to add an trim()call to the results to remove whitespaces.

也许您想添加trim()对结果的调用以删除空格。

回答by 1.44mb

Yet another option is to split the array, get first and join the rest:

另一种选择是拆分数组，先获取并加入其余部分：

var my_string = "boy, girl, dog, cat";
var splitted = my_string.split(',');
var first_item = splitted.shift();
var rest_of_the_items = splitted.join(',');

Here is the JSFiddle.

这是JSFiddle。

回答by 1.44mb

You can create an array in a lazy way and then retrieve just the first element.

您可以以懒惰的方式创建一个数组，然后只检索第一个元素。

var ArrayFromString = "boy, girl, dog, cat".split(",");
firstElement = ArrayFromString.pop();
alert(firstElement); //boy
alert(ArrayFromString); //girl, dog, cat?????????????????