Javascript基本函数文件（去空格、Email格式判断）

一般我在写Javascript文件时把一些最基本的函数写在一个文件里，供其它js文件调用，并命名为base.js

//Wipe off the blank
function trim(str){
  return str.replace(/(^/s*)|(/s*$)/g, "");   
}
//Check the string ,it should compose with the english , number, "_" or "-"
function isCharacter(str) {
    var strRequest = /^([a-zA-Z0-9._-])+/;
    if(strRequest.test(str)) {
        return true;
    }
    return false;
}

//Check the email format, it should give the value just like [e-mail] ,the symbol "@" and "." must be contained.
function isEmail(email) {
    var emailRequest = /^([a-zA-Z0-9._-])+@([a-zA-Z0-9_-])+(/.[a-zA-Z0-9_-])+/;
    if(emailRequest.test(email)) {
        return true;
    }
    return false;
}

//Check the value ,if it empty ,return false
function isEmpty(str) {
    str = trim(str);
    if(str === null || str === "") {
        return true;
    }
    return false;
}

//The string's length can't larger than the maxLength
function overMaxLeng(str, maxLength) {
    var strLeng = str.leng;
    if(strLeng > maxLength) {
        return true;
    }
    return false;
}

//The string's length can't less than the minLength
function lessMinLeng(str, minLength) {
    var strLeng = str.leng;
    if(strLeng < minLength) {
        return true;
    }
    return false;
}