javascript how to convert array to string

Javascript method to convert an array into a string: 1. Use the join() function to connect the array elements with delimiters to build a string, the syntax format is "arr.join("separator") "; 2. Use toString() function, syntax format "String(arr)".

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

Method 1: Use the join() function

join() to join the array elements with delimiters to build a string, syntax format:

arr.join("分隔符")

When calling the join() method, you can pass a parameter as a separator to join each element. If the parameter is omitted, commas are used as delimiters by default

var a = [1,2,3,4,5];  //定义数组
var s = a.join("==");  //指定分隔符
console.log(s);  //返回字符串“1==2==3==4==5”

Method 2: Use toString() function

The toString() method in the array can convert each element into string and then concatenate the output with commas for display. Grammar format:

String(arr)

Example:

var a = [1,2,3,4,5,6,7,8,9,0];  //定义数组
var s = a.toString();  //把数组转换为字符串
console.log(s);  //返回字符串“1,2,3,4,5,6,7,8,9,0”
console.log(typeof s);  //返回字符串string，说明是字符串类型

[Recommended learning: javascript advanced tutorial]

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