Detailed description of Javascript trim () function implementation

In JavaScript, we need to use trim in many places, but JavaScript does not have an independent trim function or method to use. Therefore, we need to write a trim function for our purpose.

Solution 1:
It is called as a prototype, that is, obj. trim (). This method is simple and widely used. The definition is as follows:

<Scriptlanguage = "javascript"> /** * Delete spaces between the left and right sides. */ String. prototype. trim = function () { Returnthis. replace (/(^ \ s *) | (\ s * $)/g ,"); } /** * Delete spaces on the left */ String. prototype. ltrim = function () { Returnthis. replace (/(^ \ s *)/g ,"); } /** * Delete spaces on the right */ String. prototype. rtrim = function () { Returnthis. replace (/(\ s * $)/g ,"); } </Script>

Example:

﹤scripttype=”text/javascript”﹥ alert(document.getElementById(’abc’).value.trim()); alert(document.getElementById(’abc’).value.ltrim()); alert(document.getElementById(’abc’).value.rtrim()); ﹤/script﹥

Solution 2:
It is called as a tool, that is, trim (obj). This method can be used for special processing needs and is defined as follows:

<Scripttype = "text/javascript"> /** * Delete spaces between the left and right sides. */ Functiontrim (str) { Returnstr. replace (/(^ \ s *) | (\ s * $)/g ,"); } /** * Delete spaces on the left */ Functionltrim (str) { Returnstr. replace (/(^ \ s *)/g ,"); } /** * Delete spaces on the right */ Functionrtrim (str) { Returnstr. replace (/(\ s * $)/g ,"); } </Script>

Example:

﹤scripttype=”text/javascript”﹥ alert(trim(document.getElementById(’abc’).value)); alert(ltrim(document.getElementById(’abc’).value)); alert(rtrim(document.getElementById(’abc’).value)); ﹤/script﹥

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