Convert string with commas to array

问题:

How can I convert a string to a JavaScript array?

Look at the code:

var string = "0,1"; var array = [string]; alert(array[0]); 

In this case, alert would pop-up a 0,1. When it would be an array, it would pop-up a 0, and when alert(array[1]); is called, it should pop-up the 1.

Is there any chance to convert such string into a JavaScript array?

回答1:

For simple array members like that, you can use JSON.parse.

var array = JSON.parse("[" + string + "]"); 

---

This gives you an Array of numbers.

[0, 1] 

If you use .split(), you'll end up with an Array of strings.

["0", "1"] 

---

Just be aware that JSON.parse will limit you to the supported data types. If you need values like undefined or functions, you'd need to use eval(), or a JavaScript parser.

---

If you want to use .split(), but you also want an Array of Numbers, you could use Array.prototype.map, though you'd need to shim it for IE8 and lower or just write a traditional loop.

var array = string.split(",").map(Number); 

回答2:

Split it on the , character;

var string = "0,1"; var array = string.split(","); alert(array[0]); 

回答3:

This is easily achieved in ES6;

You can convert strings to Arrays with Array.from('string');

Array.from("01") 

will console.log

['0', '1'] 

Which is exactly what you're looking for.

回答4:

If the string is already in list format, you can use the JSON.parse:

var a = "['a', 'b', 'c']"; a = a.replace(/'/g, '"'); a = JSON.parse(a); 

回答5:

For simple array members like that, you can use JSON.parse.

var listValues = "[{\"ComplianceTaskID\":75305,\"RequirementTypeID\":4,\"MissedRequirement\":\"Initial Photo Upload NRP\",\"TimeOverdueInMinutes\":null}]";  var array = JSON.parse("[" + listValues + "]"); 

This gives you an Array of numbers.

now you variable value is like array.length=1

Value output

array[0].ComplianceTaskID array[0].RequirementTypeID array[0].MissedRequirement array[0].TimeOverdueInMinutes 

回答6:

Convert all type of strings

var array = (new Function("return [" + str+ "];")()); 

Why above best practice , cause its accept string and objectstrings

var string = "0,1";  var objectstring = '{Name:"Tshirt", CatGroupName:"Clothes", Gender:"male-female"}, {Name:"Dress", CatGroupName:"Clothes", Gender:"female"}, {Name:"Belt", CatGroupName:"Leather", Gender:"child"}';  var stringArray = (new Function("return [" + string+ "];")());  var objectStringArray = (new Function("return [" + objectstring+ "];")()); 

JSFiddle https://jsfiddle.net/7ne9L4Lj/1/

Result in console

Some practice doesnt support object strings

- JSON.parse("[" + string + "]"); // throw error   - string.split(",")  // unexpected result     ["{Name:"Tshirt"", " CatGroupName:"Clothes"", " Gender:"male-female"}", "      {Name:"Dress"", " CatGroupName:"Clothes"", " Gender:"female"}", " {Name:"Belt"",    " CatGroupName:"Leather"", " Gender:"child"}"] 

回答7:

You can use split

Reference: http://www.w3schools.com/jsref/jsref_split.asp

"0,1".split(',')

回答8:

use the built-in map function with an anonymous function, like so:

string.split(',').map(function(n) {return Number(n);}); 

[edit] here's how you would use it

var string = "0,1"; var array = string.split(',').map(function(n) {     return Number(n); }); alert( array[0] ); 

回答9:

Another option using the ES6 is using Spread syntax.

var convertedArray = [..."01234"];

var stringToConvert = "012"; var convertedArray  = [...stringToConvert]; console.log(convertedArray);

回答10:

var i = "[{a:1,b:2}]",     j = i.replace(/([a-zA-Z0-9]+?):/g, '"$1":').replace(/'/g,'"'),     k = JSON.parse(j);  console.log(k)

// => declaring regular expression

[a-zA-Z0-9] => match all a-z, A-Z, 0-9

(): => group all matched elements

$1 => replacement string refers to the first match group in the regex.

g => global flag

回答11:

Why don't you do replace , comma and split('') the string like this which will result into ['0', '1'], furthermore, you could wrap the result into parseInt() to transform element into integer type.

it('convert string to array', function () {   expect('0,1'.replace(',', '').split('')).toEqual(['0','1']) }); 

回答12:

You can also use this array-make open source component that wraps any value with an array.

Examples:

 makeArray(1) // => [1]  makeArray([1]) // => [1]  makeArray(null) // => [] 

One of its 3 tests wraps a string with an array:

makeArray() should wrap an empty string with an array 

回答13:

Split (",") can convert Strings with commas into a String array, here is my code snippet.

    var input ='Hybrid App, Phone-Gap, Apache Cordova, HTML5, JavaScript, BootStrap, JQuery, CSS3, Android Wear API'     var output = input.split(",");     console.log(output); 

["Hybrid App", " Phone-Gap", " Apache Cordova", " HTML5", " JavaScript", " BootStrap", " JQuery", " CSS3", " Android Wear API"]

回答14:

I remove the characters '[',']' and do an split with ','

let array = stringObject.replace('[','').replace(']','').split(",").map(String); 

文章来源: Convert string with commas to array