JavaScript | 字符串substring()方法 (JavaScript | String substring() Method)

The String.substring() method in JavaScript is used to return a part of the string. The substring() extracted is from the given start and end index of the string.

JavaScript中的String.substring()方法用于返回字符串的一部分。 提取的substring()來自給定的字符串開始和結束索引。

Syntax:

句法：

    string.substring(startIndex, endIndex);

Parameter(s):

參數：

The method accepts two parameters, they are the starting and ending index of the substring string which is to be extracted.

該方法接受兩個參數，它們是要提取的子字符串字符串的開始和結束索引。

Return value:

返回值：

The return type of this method is string which is the substring output of the given string.

此方法的返回類型是string ，它是給定字符串的子字符串輸出。

Browser support: Chrome, Internet explorer, Mozilla, Safari, Opera mini.

瀏覽器支持： Chrome，Internet Explorer，Mozilla，Safari，Opera mini。

Example 1:

范例1：

<script>
document.write("Hello".substring(1,3) + "<br/>");
document.write("Hello".substring(0,2) + "<br/>");
document.write("Hello".substring(0,5) + "<br/>");
document.write("Hello".substring(0,8) + "<br/>"); //no error
document.write("Hello World!".substring(6,12) + "<br/>");
</script>

Output

輸出量

el
He
Hello
Hello
World!

Example 2:

范例2：

<script>
str = "www.includehelp.com";
document.write(str.substring(0,3) + "<br/>");
document.write(str.substring(4,15) + "<br/>");
document.write(str.substring(16,19) + "<br/>");
document.write(str.substring(0) + "<br/>");
document.write(str.substring(4) + "<br/>");
document.write(str.substring(16) + "<br/>");
</script>

Output

輸出量

www
includehelp
com
www.includehelp.com
includehelp.com
com

翻譯自: https://www.includehelp.com/code-snippets/string-substring-method-with-example-in-javascript.aspx