// 是否为空，非空返回真，不非为空返回假
function isBlank(str) { var blankFlag = true; if (str.length == 0) return true; for (var i = 0; i < str.length; i++) { if ((str.charAt(i) != "") && (str.charAt(i) != " ")) { blankFlag = false; break; } } return blankFlag; }function checkNotNull(theField, fieldName) {
if(isBlank(theField.value)){ alert(fieldName + "不可为空！"); theField.focus(); return false; }return true;
}// 是否为数字
function checkNumber(theField, fieldName) { var pattern = /^([0-9]|(-[0-9]))[0-9]*((.[0-9]+)|([0-9]*))$/;if(theField.value == "") return true;
if (!pattern.test(theField.value)) { alert(fieldName + "必须为合法数字"); theField.focus(); theField.select(); return false; }return true;
}// 是否为指定范围数字
function checkNumberRange(theField, fieldName, min, max) { if(theField.value == "") return true; if (!checkNumber(theField, fieldName)) return false;if ((min != "") && (theField.value < min)) {
alert(fieldName + "不可小于" + min + "！"); theField.focus(); theField.select(); return false; }if ((max != "") && (theField.value > max)) {
alert(fieldName + "不可超过" + max + "！"); theField.focus(); theField.select(); return false; }return true;
}// 是否为整数
function checkInteger(theField, fieldName) { var pattern = /^(d|(-d))d*$/;if(theField.value == "") return true;
if (!pattern.test(theField.value)) { alert(fieldName + "必须为整数！"); theField.focus(); theField.select(); return false; }return true;
}// 是否为指定范围内整数
function checkIntegerRange(theField, fieldName, min, max) { if(theField.value == "") return true; if (!checkInteger(theField, fieldName)) return false;if ((min != "") && (theField.value < min)) {
alert(fieldName + "不可小于" + min + "！"); theField.focus(); theField.select(); return false; }if ((max != "") && (theField.value > max)) {
alert(fieldName + "不可超过" + max + "！"); theField.focus(); theField.select(); return false; }return true;
}// 是否为正数
function checkPositiveNumber(theField, fieldName) { if(theField.value == "") return true; if (theField.value.charAt(0) == '-') { alert(fieldName + "必须为正数！"); theField.focus(); return false; }return true;
}// 限制字串最大长度
function checkLength(theField, fieldName, maxLength) { if(theField.value == "") return true; if (theField.value.length > maxLength) { alert(fieldName + "的字数最多为" + maxLength + "字！"); theField.select(); theField.focus(); return false; }return true;
}// 限制字串长度,注意参数顺序
function checkLength2(theField, fieldName, maxLength, minLength) { if(theField.value == "") return true; if (theField.value.length > maxLength) { alert(fieldName + "的字数最多为" + maxLength + "字！"); theField.focus(); return false; }if ((minLength != "") && (theField.value.length < minLength)) {
alert(fieldName + "的字数最少为" + minLength + "字！"); theField.focus(); return false; }return true;
}// 所输入字符串是否均为合法字符
// charBag中为包含所有合法字符的字符串 function checkStrLegal(theField, fieldName, charBag) { if(theField.value == "") return true; for (var i = 0; i < theField.value.length; i++) { var c = theField.value.charAt(i); if (charBag.indexOf(c) == -1) { alert(fieldName + "含有非法字符(" + c + ")！"); theField.focus(); return false; } }return true;
}// 所输入字符串是否均为合法字符
// charBag中为包含非法字符的字符串 function checkStrLegal2(theField, fieldName, charBag) { if(theField.value == "") return true; for (var i = 0; i < theField.value.length; i++) { var c = theField.value.charAt(i); if (charBag.indexOf(c) > -1) { alert(fieldName + "含有非法字符(" + c +")！"); theField.focus(); return false; } }return true;
}// 电子邮件验证
function checkEmail(theField) { var pattern = /^.+@.+..+$/;if(theField.value == "") return true;
if (!pattern.test(theField.value)) { alert("请输入合法的电子邮件地址"); theField.focus(); theField.select(); return false; }return true;
}// 弹出一个窗口, 使用系统默认弹开位置
function popWindow(url, width, height, title){ window.open(url,"_blank","toolbar=no,location=no,directories=no, status=no,menubar=no,scrollbars=yes,resizable=yes,width="+width+ ",height="+height+",title="+title); }