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Javascript verification email

Source: Internet
Author: User
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 First: javascript verification email format <br/> <script language = JavaScript runat = Server> <br/> function isemail (stremail) {<br/> If (stremail. search (/^/W + (-/W +) | (/. /W +) */@ [A-Za-z0-9] + ((/. |-) [A-Za-z0-9] + )*/. [A-Za-z0-9] + $ /)! =-1) <br/> return true; <br/> else <br/> alert ("oh "); <br/>}< br/> </SCRIPT> <br/> <input type = text onblur = isemail (this. value)> </P> <p> type 2: use JavaScript to verify whether email is entered correctly <br/> <HTML> <br/> <pead> <br/> <title> test </title> <br/> <MCE: script Language = "JavaScript"> <! -- <Br/> function emailcheck () {<br/> var emailstr = document. all. form1.tel. value; <br/> alert (emailstr); <br/> var emailpat =/^ (. + )@(. +) $/; <br/> var matcharray = emailstr. match (emailpat); <br/> If (matcharray = NULL) {<br/> alert ("the email address must include (@ and .) ") <br/> return false; <br/>}< br/> return true; <br/>}< br/> // --> </MCE: SCRIPT> <br/> </pead> </P> <p> <body> <br/> <form name = "form1"> <br/> <input type = "text" name = "tel"/> <br/> <input type = "button" value = "Press" onclick = "emailcheck () "/> <br/> </form> </P> <p> </span> <br/> </body> <br/> </ptml> </ p> <p> 3: <br/> JS verification email <br/> function char_test (CHR) <br/> // character detection function <br/>{< br/> var I; <br/> var smallch = "abcdefghijklmnopqrstuvwxyz"; <br/> var bigch = "abcdefghijklmnopqrstuvwxyz"; <br/> for (I = 0; I <26; I ++) <br/> If (CHR = smallch. charat (I) | CHR = bigch. charat (I) <br/> return (1); <br/> return (0); <br/>}</P> <p> function spchar_test (CHR) <br/> // number and special character detection function <br/>{< br/> var I; <br/> var spch = "_-. 0123456789 "; <br/> for (I = 0; I <13; I ++) <br/> If (CHR = spch. charat (I) <br/> return (1); <br/> return (0); <br/>}</P> <p> function email_test (STR) <br/>{< br/> var I, flag = 0; <br/> var at_symbol = 0; <br/> // "@" detected location <br/> var dot_symbol = 0; <br/> // ". "detected location <br/> If (char_test (Str. charat (0) = 0) <br/> return (1 ); <br/> // the first character must contain letters </P> <p> for (I = 1; I <Str. length; I ++) <br/> If (Str. charat (I) = '@') <br/>{< br/> at_symbol = I; <br/> break; <br/>}< br/> // check the "@" position </P> <p> If (at_symbol = Str. length-1 | at_symbol = 0) <br/> return (2 ); <br/> // No email server domain name </P> <p> If (at_symbol <3) <br/> return (3 ); <br/> // The account contains less than three characters </P> <p> If (at_symbol> 19) <br/> return (4 ); <br/> // The account contains more than 19 characters </P> <p> for (I = 1; I <at_symbol; I ++) <br/> If (char_test (Str. charat (I) = 0 & spchar_test (Str. charat (I) = 0) <br/> return (5); <br/> for (I = at_symbol + 1; I <Str. length; I ++) <br/> If (char_test (Str. charat (I) = 0 & spchar_test (Str. charat (I) = 0) <br/> return (5 ); <br/> // other special characters cannot be used </P> <p> for (I = at_symbol + 1; I <Str. length; I ++) <br/> If (Str. charat (I) = '. ') dot_symbol = I; <br/> for (I = at_symbol + 1; I <Str. length; I ++) <br/> If (dot_symbol = 0 | dot_symbol = Str. length-1) <br/> // check whether ". <br/> return (6); </P> <p> return (0 ); <br/> // The email name is valid <br/>}

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