Javascript 如何在javascript中将数组转换为逗号分隔的字符串
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How to convert array into comma separated string in javascript
提问by David
I have an array
我有一个数组
a.value = [a,b,c,d,e,f]
a.value = [a,b,c,d,e,f]
How can I convert to comma seperated string like
如何转换为逗号分隔的字符串，如
a.value = "a,b,c,d,e,f"
a.value = "a,b,c,d,e,f"
Thanks for all help.
感谢所有帮助。
回答by Vitim.us
The method array.toString()actually calls array.join()which result in a string concatenated by commas. ref
该方法array.toString()实际调用的array.join()结果是一个由逗号连接的字符串。参考
var array = ['a','b','c','d','e','f'];
document.write(array.toString()); // "a,b,c,d,e,f"Also, you can implicitly call Array.toString()by making javascript coerce the Arrayto an string, like:
此外，您可以Array.toString()通过将 javascript 强制Array为 an来隐式调用string，例如：
//will implicitly call array.toString()
str = ""+array;
str = `${array}`;
Array.prototype.join()
Array.prototype.join()
The join()method joins all elements of an array into a string.
在加入（）方法连接到一个字符串数组的所有元素。
Arguments:
参数：
It accepts a separatoras argument, but the default is already a comma ,
它接受 aseparator作为参数，但默认值已经是逗号,
str = arr.join([separator = ','])
Examples:
例子：
var array = ['A', 'B', 'C'];
var myVar1 = array.join(); // 'A,B,C'
var myVar2 = array.join(', '); // 'A, B, C'
var myVar3 = array.join(' + '); // 'A + B + C'
var myVar4 = array.join(''); // 'ABC'
Note:
笔记：
If any element of the array is undefined or null , it is treated as an empty string.
如果数组的任何元素是 undefined 或 null ，则将其视为空字符串。
Browser support:
浏览器支持：
It is available pretty much everywhere today, since IE 5.5 (1999~2000).
从 IE 5.5 (1999~2000) 开始，它现在几乎无处不在。
References
参考
回答by Renan
Use the joinmethodfrom the Array type.
使用Array 类型的join方法。
a.value = [a, b, c, d, e, f];
var stringValueYouWant = a.join();
The joinmethod will return a string that is the concatenation of all the array elements. It will use the first parameter you pass as a separator - if you don't use one, it will use the default separator, which is the comma.
该join方法将返回一个字符串，它是所有数组元素的串联。它将使用您传递的第一个参数作为分隔符 - 如果您不使用，它将使用默认分隔符，即逗号。
回答by Aer0
You can simply use JavaScripts join()function for that. This would simply look like a.value.join(','). The output would be a string though.
您可以简单地使用 JavaScriptsjoin()函数。这看起来就像a.value.join(','). 虽然输出将是一个字符串。
