js writing trim() function and the use of regular expressions_javascript skills

1.js itself does not have a trim function, but you can write one yourself

Copy code The code is as follows:

function trim(str) {
var newStr = str.replace(/^s*$/g,'')
retrun newStr;
}

2. Remove the spaces at the left and right ends of the string. You can easily use trim, ltrim or rtrim in vbscript, but there are no these three built-in methods in js and you need to write them manually. The following implementation method uses regular expressions, which is very efficient, and adds these three methods to the built-in methods of the String object.

The method format written as a class is as follows: (str.trim();)

Copy code The code is as follows:

It can be written as a function like this: (trim(str))