常用JavaScript代码库（又名：WFang.js）

1.根据公司项目封装ajax请求，结合layer框架一起使用

/*提取接口公共部分*/
var ApiConf = {
    server:"http://localhost:8080/Battery/",
};

/**
 * 调用接口方法
 * api:接口
 * callback:回调函数
 * info:参数
 * type:请求方式
 */
function WFang (api, callback, info , type){
    //加载动画
    layer.load();
    //参数
    var data = info;
    var contentType = 'application/x-www-form-urlencoded; charset=UTF-8';
    if(type == 'post'){
        contentType = 'application/json';
    }else if(type == 'get'){
        contentType = 'application/x-www-form-urlencoded; charset=UTF-8';
    }
    if (typeof(data) === 'undefined') {
        layer.msg("提交的参数缺失", "出现错误了哦：");
        return;
    }
    window.ajax_request = $.ajax({
        type: type,
        dataType: 'json',
        async: 'false',
        xhrFields: {
            withCredentials: true
        },
        crossDomain: true, 
        url: ApiConf.server+api,
        data: info,
        success: function(data) {
            //停止加载动画
            layer.closeAll('loading');
            if (data.status) {
                callback(data);
            }
            else if (data.status==false){
                callback(data);
            }
        },
        error: function(XMLHttpRequest) {
            layer.msg('服务器遇到了问题哦，请联系客服~~~');
        },
        complete: function(XMLHttpRequest, textStatus){
            window.ajax_request = null;
        },
        contentType:contentType
        //contentType:'application/x-www-form-urlencoded; charset=UTF-8'
    });
}

/**
 * 接口方法使用示例
 * 登录(包含cookie存储)
 */
function user_login(userName,password){
    WFang ("user/userLogin",function(arr){
        var yCode = $('.yCode').val().trim().toUpperCase();
        var code = $('.yzm').html();
          if(arr.status == false){
              layer.msg(arr.message);
           }else{
               if ($("#remid").is(':checked') == true) {
                   var username = $('#uname').val().trim();
                   var password = $('#upwd').val().trim();
                   $.cookie("rmbUser", "true", { expires: 30 }); //存储一个带30天期限的cookie
                   $.cookie("username", userName, { expires: 30 });
                   $.cookie("password", password, { expires: 30 });
               }
               else {
                   $.cookie("rmbUser", "false", { expire: -1 });
                   $.cookie("username", "", { expires: -1 });
                   $.cookie("password", "", { expires: -1 });
               }
               var jumpto ="index.html";  
            window.location.replace(jumpto);
            window.sessionStorage.setItem(UrlConf.tk_rolename,arr.data.realName.trim());
            window.sessionStorage.setItem(UrlConf.tk_uid,arr.data.userId.trim());
            window.sessionStorage.setItem(UrlConf.tk_uPhone,arr.data.phone.trim());
           }
    },{userName:userName,password:password}
  )     
};
/**
 * 接口方法使用示例
 * 注销
 */
function logout() {
    WFang ("user/loginOut",function(arr){
        if(arr.status){
            // TODO clear all cookies
            $.cookie("rmbUser", "false", { expire: -1 });
               $.cookie("username", "", { expires: -1 });
               $.cookie("password", "", { expires: -1 });
            layer.msg("退出登录");
            setTimeout("window.location.href='login.html'",1000);
        }
    },{},'get');
}

2.生成验证码

/**
 * 生成验证码方法
 * 可用于登录页面生成验证码
 */
function createCode(){
    var code = "";
    var codeLength = 4;//验证码的长度
    var random = ['A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R',
         'S','T','U','V','W','X','Y','Z'];//随机数
    for( var i = 0; i < codeLength; i++ ) {//循环操作
       var index = Math.floor(Math.random()*26);//取得随机数的索引（0~35）
       code += random[index];//根据索引取得随机数加到code上
    }
     $('.yzm').html(code);//把code值赋给验证码
}

3.时间戳转日起对象

/**
 * 时间戳转换成日期对象
 */
function getLocalTime(nS) {     
    return new Date(parseInt(nS)).toLocaleString().replace(/年|月/g, "-").replace(/日/g, " ");   
}  

4.截取url参数

/**
 * 截取url参数
 * 用于截取页面之间传递的参数
 */
function getUrl(){
    var search = location.search;
    var params = {};
    if(params != ''){
        var ps = search.slice(1).split('&');
        for(var i = 0;i < ps.length;i++){
            var arr = ps[i].split('=');
            params[arr[0]] = arr[1];
        }
    }
    return params;
}

5.去除前后空格

/**
 * 去除前后空格
 * 前端传给后台的参数需去除前后空格
 */
function Trim(str){ 
    return str.replace(/(^s*)|(s*$)/g, ""); 
}

6.获得字符串长度

/**
 * 获得字符串长度
 * 可用于表单输入长度验证
 */
function getLen(str){
    var len = 0;
    for(var i = 0;i < str.length;i++){
        if(str.charCodeAt(i)>255){//charCodeAt() 方法可返回指定位置的字符的 Unicode 编码
            len += 2;
        }else{
            len++;
        }
    }
    return len;
}

7.图片压缩上传

/**
 * 图片压缩上传
 * 上传前用js对图片压缩，把利用canvas生成的base64字符串，传入后台，
 * （无所谓ajax或者form，同时也可以解决图片无刷新上传），
 * 在Java后台将获取到的base64字符串输出为图片，即可。
 */
function caseUploadFile(files, callback) {
    var fd = new FormData();
    fd.append("fileCommon.fileSource", "lists");
    fd.append("fileCommon.fileType", "JPG,BMP,GIF,TIF,PNG");
    for (var i = 0; i < files.length; i++) {
        var file = files[i];
        var URL = window.URL || window.webkitURL;
        var blob = URL.createObjectURL(file);
        //画图
        var img = new Image();
        img.src = blob;
        img.onload = function() {
            var that = this;
            //生成比例
            var w = that.width,
                h = that.height,
                scale = w / h;
            w = 640 || w;
            h = w / scale;

            //生成canvas
            var canvas = document.createElement('canvas');
            var ctx = canvas.getContext('2d');
            $(canvas).attr({
                 w,
                height: h
            });
            ctx.drawImage(that, 0, 0, w, h);
            /**
             * 生成base64
             * 兼容修复移动设备需要引入mobileBUGFix.js
             */
            var base64 = canvas.toDataURL('image/jpeg', 0.8 || 0.8);
            
            // 修复IOS
            if (navigator.userAgent.match(/iphone/i)) {
                var mpImg = new MegaPixImage(img);
                mpImg.render(canvas, {
                    maxWidth: w,
                    maxHeight: h,
                    quality: obj.quality || 0.8
                });
                base64 = canvas.toDataURL('image/jpeg', 0.8 || 0.8);
            }

            // 修复android
            if (navigator.userAgent.match(/Android/i)) {
                var encoder = new JPEGEncoder();
                base64 = encoder.encode(ctx.getImageData(0, 0, w, h), 0.8 * 100 || 80);
            }
            imgData = base64;
            fd.append("files.filess", files[0]);
        };
    }
    var xhr = new XMLHttpRequest();
    if (typeof(callback) === 'function') {
        xhr.addEventListener("load", function (evt) {
            Toast(null, null, null, 3);
            callback(evt);
        }, false);
    }
    xhr.addEventListener("error", uploadFailed, false);
    xhr.addEventListener("abort", uploadCanceled, false);
    xhr.open("POST", ApiConf.server + ApiConf.case_upload_img);
    xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
    xhr.send(fd);
}

8.文件上传

/*文件上传(待续)*/
function uploadFile(){
    var that=this;//保存当前this
    var file = that.files[0];
    var fd = new FormData();
    fd.append("file", file);
    fd.append("fileDesc", "test");
    layer.load(0);
    $.ajax({
            async: true,
          url: ApiConf+'Resource/ResourceAdd',
          type: "POST",
          dataType: 'json',
          data: fd,
          contentType: false,
          beforeSend: function (xhr) {
              xhr.setRequestHeader("authorization", token);
          },
          xhr: function() {
              myXhr = $.ajaxSettings.xhr();
              return myXhr;
          },
          success:function(arr) {
                //头像id
              that.setAttribute('name',arr.data[0].resourceid);
              layer.msg('文件上传成功',{icon: 1});
              layer.closeAll('loading');
          },
          error:function() {
              layer.msg("上传失败");
          },
          cache:false,
          processData:false
    });
}

9.全选/全不选

/*
 * 全选/全不选
 */
function selectAll(objSelect) {
    if (objSelect.checked == true) {
        $("input[name='chkId']").attr("checked", true);
        $("input[name='chkAll']").attr("checked", true);
    }
    else if (objSelect.checked == false) {
        $("input[name='chkId']").attr("checked", false);
        $("input[name='chkAll']").attr("checked", false);
    }
}

10.判断两个日期大小

/*
 * 判断两个日期大小
 * 得到日期值并转化成日期格式，replace(/-/g, "/")是根据验证表达式把日期转化成长日期格式，这样再进行判断就好判断了
 */
function ValidateDate() {
    var beginDate = $("#t_datestart").val();
    var endDate = $("#t_dateend").val();
    if (beginDate.length > 0 && endDate.length>0) {
        var sDate = new Date(beginDate.replace(/-/g, "/"));
        var eDate= new Date(endDate.replace(/-/g, "/"));
        if (sDate > eDate) {
            alert('开始日期要小于结束日期');
            return false;
        }
    }
}

11.回车提交

/*
 * 回车提交
 */
$("id").onkeypress = function (event) {
    event = (event) ? event : ((window.event) ? window.event : "")
    keyCode = event.keyCode ? event.keyCode : (event.which ? event.which : event.charCode);
    if (keyCode == 13) {
        $("SubmitLogin").onclick();
    }
}

12.获得当前时间

/*
 * 获得当前时间
 */
function checkTime(i){
    if(i<10){
        i="0"+i;
    }
        return i;
}
function showTime(){
    var date=$("#spanData");
    var mydate=new Date;
    var y=mydate.getFullYear();
    var m=mydate.getMonth()+1;
    var d=mydate.getDate();
    var w=mydate.getDay();
    var h=mydate.getHours();
    var f=mydate.getMinutes();
    var s=mydate.getSeconds();
    f=checkTime(f);
    s=checkTime(s);
    var week="";
    var week=['星期日','星期一','星期二','星期三 ','星期四','星期五','星期六'];
    date.html(y+"年"+m+"月"+d+"日"+" "+week[w]+" "+h+":"+f+":"+s);
    setTimeout(showTime,1000);
}

 13.验证邮箱的格式

var reg = /^(w)+(.w+)*@(w)+((.w{2,3}){1,3})$/;