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This article mainly explains how to use the substring () method of javascript. The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn how to use the substring () method of javascript.

In javascript, the substring () method is used to extract characters that are mediated between two specified subscripts, syntax "string.substring (from,to)"; the substring returned by this method includes the character at the "from" parameter, but not the character at the "to" parameter.

The operating environment of this tutorial: windows7 system, javascript1.8.5 version, Dell G3 computer.

In javascript, the substring () method is used to extract characters that are mediated between two specified subscripts.

Syntax:

The string.substring (from, to) parameter describes that from is required. A non-negative integer that specifies the position of the first character of the substring to be extracted in the string Object. To is optional. A non-negative integer that is 1 more positioned in string Object than the last character of the substring to be extracted.

If this parameter is omitted, the substring returned will go all the way to the end of the string.

The substring returned by the substring () method includes the character at the beginning of the from, but not the character at the end of the to.

Example:

Var str= "Hello world!"; console.log (str.substring (3meme 7))

If the second parameter is omitted, all characters from the start position to the end are extracted.

Var str= "Hello world!"; console.log (str.substring (3))

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