1、校验输入的长度不能超长

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使用：<input type="text" size="15"? name="fDept" onblur="fc_chk_byte(this,50);"/>

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function fc_chk_byte(aro_name,ari_max){

??????? var ls_str????? = aro_name.value;
??????? var li_str_len? = ls_str.length;?????
???????
??????? var rtn???????? = true;
??????? var li_max????? = ari_max;
??????? var i?????????? = 0;
??????? var li_byte???? = 0;
??????? var li_len????? = 0;
??????? var ls_one_char = "";
??????? var ls_str2???? = "";

??????? for(i=0; i< li_str_len; i++) {

??????????? ls_one_char = escape(ls_str.charAt(i));

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??????????? if ( ls_one_char.length == 1 ) {
???????????? li_byte ++;
??? ???? } else if (ls_one_char.indexOf("%u") != -1) {
??????? ???? li_byte += 2;
??????? ?} else if (ls_one_char.indexOf("%") != -1) {
??????????? ?li_byte += ls_one_char.length/3;
??????? ?}
???????????
??????????? if(li_byte <= li_max) {
??????????????? li_len = i + 1;
??????????? }
??????? }

??????? if(li_byte > li_max) {
??????????? alert("???? ??? " +li_max+"???? ?? ?????.");???????????
??????????? ls_str2 = ls_str.substr(0, li_len);
??????????? aro_name.value = ls_str2;???????
??????????? rtn = false;
??????????? aro_name.focus();
??????? }
???????
??????? return rtn;
}

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2、使用正则表达式，校验必须输入英文和空格

<input type="text" size="15" name="fName" onkeyup="this.value=this.value.replace(/[^a-zA-Z\s]/g,'')"/>

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3、使用正则表达式，校验只能输入数字

<input type="text" size="15" maxlength=30 name="fTel" onblur="fc_chk_byte(this,50);" onkeyup="this.value=this.value.replace(/[^\d\-]/g,'')"/>
?????????????????

4、校验是否为空

function doCheckForm(){

?if(isEmpty(f.bDept))
?{
??? ?alert('部门不能为空');
??? ?f.bDept.focus();
??? ?return;
?}

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?return true;

?}

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function isEmpty(input) {
??? if (input.value == null || input.value.replace(/ /gi,"") == "") {
??????? return true;
??? }
??? return false;
}

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5、校验email是否合法

?function doCheckForm(){

?if(!isValidEmail(f.fEmail)&&f.fEmail.value.length>0)
?{
???? alert('email不合法');
???? f.fEmail.focus();
???? return;
?}

?return true;

?}

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function isValidEmail(input) {
??? var format = /^((\w|[\-\.])+)@((\w|[\-\.])+)\.([A-Za-z]+)$/;
??? return isValidFormat(input,format);
}