JavaScript registration verification

function formCheck() {

if (document.forms[0].userName.value==""){

alert("Please fill in your user name! ");

document.forms[0].userName.focus();

return false;

}

var filter=/^s*[A-Za-z0-9]{6 ,20}s*$/;

if (!filter.test(document.forms[0].userName.value)){

alert("The user name is incorrect, please refill it! The characters that can be used are (A-Z a-z 0-9) The length should be no less than 6 characters and no more than 20 characters. Be careful not to use spaces ");

document.forms[0].userName.focus();

document.forms[0 ].userName.select();

return false;

}

if (document.forms[0].password.value=="") {

alert("Please fill in your password!");

document.forms[0].password.focus();

return false;

}

var filter=/^s*[A-Za-z0-9]{6,20}s*$/ ;

if (!filter.test(document.forms[0].password.value)){

alert("The password is incorrect, please refill it! The usable characters are (A-Z a-z 0-9) length No less than 6 characters, no more than 20 characters, be careful not to use spaces ");

document.forms[0].password.focus();

document.forms[0].password.select();

return false;

}

if (document.forms[0].pwd.value==""){

alert("Please enter your confirmation password!");

document.forms[0 ].pwd.focus();

return false;

}

if (document.forms[0].password.value!=document.forms[0].pwd.value){

alert("two The passwords filled in twice are inconsistent, please fill them in again! ");

document.forms[0].password.focus();

document.forms[0].password.select();

return false;

}

if (document.forms[0 ].name.value==""){

alert("Please fill in your real name!");

document.forms[0].name.focus();

return false;

}

var patrn=/^[u0391-uFFE5]{2,4}$/; //Regular expression to determine whether it is Chinese

if (!patrn.test(document.forms[0].name.value)) {

alert("Please enter your real name, 2-4 Chinese characters!");

document.forms[0].name.focus();

document.forms[0].name.select();

return false;

}

if (document.forms[0].age.value==""){

alert("Please enter your age!");

document.forms[0] .age.focus();

return false;

}

var number=/^[0-9]{1,3}$/;

if (!number.test(document.forms[0] .age.value)){

alert("Please enter your age (must be a number)!");

document.forms[0].age.focus();

return false;

}

if (document.forms[0].stature.value==""){

alert("Please fill in your height!");

document.forms[0].stature.focus();

return false;

}

var stature=/^[0-9]{1,3}$/;

if (!stature.test(document.forms[0].stature.value)){

alert("Please enter your height (must be a number)!");

document.forms[0].stature.focus();

return false;

}

if (document.forms[0] .tel.value==""){

alert("Please fill in your contact number! ");

document.forms[0].tel.focus();

return false;

}

var tel =/(^([0][1-9]{2,3}[- ])?d{3,8}(-d{1,6})?$)|(^([0][1-9]{2,3})d{3,8}((d{1 ,6}))?$)|(^d{3,8}$)|(^[1][3][0-9]{9}$)|(^0[1][3][0 -9]{9}$)/;

if (!tel.test(document.forms[0].tel.value)) {

alert("Please enter the correct phone number (mobile phone number)!") ;

return false;

}

if(document.forms[0].mail.value==""){

alert("Please enter your E-Mail!");

document.forms [0].mail.focus();

return false;

}

var mail = /^([-_A-Za-z0-9.]+)@([_A-Za-z0-9] +.)+[A-Za-z0-9]{2,3}$/;

if(!mail.test(document.forms[0].mail.value)){

alert("E- The mail format is incorrect, please fill it in again! ");

document.forms[0].mail.focus();

document.forms[0].mail.select();

return false;

}

if(document.forms[0].school.value==""){

alert("Please enter your school!");

document.forms[0].school.focus();

return false;

}

var school=/^[u0391-uFFE5]{1,20}$/;

if (!school.test(document.forms[0].school.value)){

alert("Please enter your school (must be in Chinese characters)!");

document.forms[0].school.focus();

document.forms[0].school.select();

return false;

}

return true;

}

Submit form:

Note: forms[0] in

document.forms[0].userName.value is the first form in your web page, and so on; userName is your input text box name ();