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This article mainly explains "how to use JavaScrip regular expression to verify form form", the content of the article is simple and clear, easy to learn and understand, now please follow the editor's train of thought slowly in depth, together to study and learn "how to use JavaScrip regular expression to verify form form" bar!

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Function show () {/ / Pop up a prompt box window.alert ("hh");} / bind the show method to the button _ window.onload=function () {/ / navigate to the button var buttonElement=document.forms [0] .mybtn; / / dynamically bind the show method buttonElement.onclick=show / / show if you add (), the prompt box will pop up as soon as the web page is loaded} function validateForm () {var loginform=document.forms [1]; var username=trim (loginform.username.value); var password=trim (loginform.password.value); var email=trim (loginform.email.value); / / alert ("alternative length before:" + username.length); / / username=trim (username); / / alert ("length after substitution:" + username.length) / / determine that the user name is required: if (username.length==0) {alert ("user required");} else if (! / ^ [a-zA-Z0-9] + $/ .test (username)) {alert ("user name must be alphabet");} else if (password.length==0) {alert ("password required") } else if (! / ^ [0-9] {6} $/ .test (password)) {alert ("password must be 6 digits");} else if (email.length==0) {alert ("required mailbox");} else if (! / ^\ wang @\ w + (\.\ w+) + $/ .test (email)) {alert ("incorrect mailbox format") } return false;} / / Custom a parameter function trim (s) {/ / s.REPLACE (regular expression, substituted character) s=s.replace (/ ^\ s alternate character); return s; .myclass {position: absolute; left: 400px; top: 150px;}

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