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Getting started with the substr method of JavaScript string objects (used to intercept strings)_Basic knowledge

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2016-05-16 16:33:341269browse

JavaScript substr method

The

substr method is used to intercept a string based on the starting position and length and return the intercepted part of the string. Its syntax is as follows:

Copy code The code is as follows:

str_object.substr(start, length)

Parameter description:

参数 说明
str_object 要操作的字符串(对象)
start 必需。开始截取的位置,从 0 开始计算;如果为负数则从字符串末尾开始计算(经测试,某些浏览器版本下无效)
length 可选。指要截取的字符串长度,省略则至到字符串结束

Tip: The substr method does not comply with the ECMAscript standard and is therefore not recommended.

substr method instance

Copy code The code is as follows:


Run this example, output: jb51

Copy code The code is as follows:

jb51
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