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This article mainly explains "how to use js regular expression to check positive, negative and decimal numbers". The content of the article 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 js regular expression to check positive, negative and decimal numbers".

Don't say much, just attach a code example for reference only.

Function validation () {var val = document.getElementById ("txtNumber"). Value; var regu = / ^ (\-|\ +)?\ d+ (\.\ d+)? $/; if (val! = ") {if (! regu.test (val)) {document.getElementById (" labResult "). Style.color =" red "; document.getElementById (" labResult ") [xss_clean] =" Verification failed! " ;} else {document.getElementById ("labResult"). Style.color = "green"; document.getElementById ("labResult") [xss_clean] = "Verification successful!" ;}

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