基本表单校验（Base form check）.docVIP

基本表单校验（Base form check） / / this JS file check is a pop-up warning box Function, checkdata () { The user name first converted to lowercase / / VaR, ssn=form.username.value.toLowerCase (); Username / check If (... CheckUserName (SSN)) return false; Check digit / password If (strlen (form.pwd.value) 6 || strlen (form.pwd.value) 16) { Alert (\ \ correctly login password length is 6-16 bits, only available in English, numbers, special characters! ); Position the cursor / password input field, improve the user experience Form.pwd.focus (); Return false; } Check digit / / confirm password If (strlen2 (form.pwd.value)) { Alert (\ \ your password contains illegal characters, only English, numbers, and special characters! ); Form.pwd.focus (); Return false; } If (form.pwd.value = = form.username.value) { Alert (\ user name and password cannot be the same! ); Form.pwd.focus (); Return false; } If (form.pwd2.value = = {) Alert \ \ \ enter password confirmation, please! ); Form.pwd2.focus (); Return false; } If (form.pwd2.value = = form.pwd.value) { Alert (\ \ two password input is inconsistent! ); Form.pwd.focus (); Return false; } / / sex check (if! (form.sex[0].checked || form.sex[1].checked)) { Alert (please choose sex!); Form.sex[0].focus (); Return false; } / / provinces check If (form.province.selectedIndex = = 0) { Can / form.province.value==hubei, but the use of selectedIndex recommended, because there may be no option write the value attribute Alert (please choose the provinces); Form.province.focus (); Return false; } Check / self introduction If (form.intro.value = = {) Alert (` self introduction cannot be empty ); Form.intro.focus (); Return false; } All the individual / / the form through the examination, examination by Return true; } Check the user name / function Function checkUserName (SSN) { Check / username length If (ssn.length3 || ssn.length18) { Alert \ \ \ enter the correct user name, and the user name is 3-18 bits long! ); Form.username.focus (); Return