JavaScript string object entry instance of the substr method (for intercepting strings)
- 2020-03-30 04:06:22
- OfStack
JavaScript substr method
The substr method is used to intercept a string based on its starting position and length and to return a partially truncated string. The syntax is as follows:
str_object.substr(start, length)
Parameter description:
| parameter | instructions |
|---|---|
| str_object | String (object) to manipulate |
| start | A necessity. Start intercepting the position from 0 Start counting; If it is negative, it starts at the end of the string (which is not valid in some browser versions) |
| length | Optional. Indicates the length of the string to be truncated, and omits to the end of the string |
Tip: the substr method does not conform to the ECMAscript standard, so it is not recommended.
Instance of the substr method
<script language="JavaScript">
var str = "www.jb51.net";
document.write( str.substr(4,5) );
</script>
Run the example, output: jb51
jb51