一个前端框架应该有的一些公共函数

 一、防止ie浏览器按backspace回退页面

//防止后退返回页面,如果非文本框、密码框、文本域控件，或控件非可用装填，则禁用后退按键
var ua=navigator.userAgent.toLowerCase(); 
var isIE=ua.indexOf("msie")>-1;
window.document.onkeydown =function(e){
    var e = e;
    var obj;        //事件源
    var t;            //控件类型
    var keyCode;    //按键ascii码
    if(isIE){
        e = event || window.event;
        keyCode = e.keyCode;
    }else{
        keyCode = e.keyCode || e.which;
        if(keyCode==undefined||keyCode==null||keyCode==''){
            keyCode=String.fromCharCode(e.charCode);
        }
    }
    obj = e.target || e.srcElement; //获取事件源 
    t = obj.type || obj.getAttribute('type'); 
    if (e.keyCode==8 && (obj.readOnly || obj.disabled || (t != "password" && t != "text" && t != "textarea" && obj.tagName!=='INPUT'))) {
        return false;
    }
};

二、获取页面传参 

// 获取参数
var name = window.location.search;  //获取？后面的字符串

function getUrlParam(name) {
    var urlArr = [],urlObj={};
    name = decodeURI(name);
    urlArr=name.substring(1).split('&');
    for(var i =0;i<urlArr.length;i++){
        var valueArr=urlArr[i].split('=');
        urlObj[valueArr[0]]=valueArr[1];
    }
    return urlObj;
}

三、加载动画（避免重复点击机制），初始化ajax（以jquery为例）

jQuery.bootstrapLoading = {
    start: function (options) {
        var defaults = {
            opacity: 1,
            //loading页面透明度
            backgroundColor: "rgba(0,0,0,0.3)",
            //loading页面背景色
            borderColor: "#bbb",
            //提示边框颜色
            borderWidth: 0,
            //提示边框宽度
            borderStyle: "solid",
            //提示边框样式
            loadingTips: "",
            //提示文本
            TipsColor: "#666",
            //提示颜色
            delayTime: 1000,
            //页面加载完成后，加载页面渐出速度
            zindex: 99999999,
            //loading页面层次
            sleep: 0,
            //设置挂起,等于0时则无需挂起
             '150px',
            height: '165px',
        }
        var options = $.extend(defaults, options);

        //获取页面宽高
        var _PageHeight = document.documentElement.clientHeight,
        _PageWidth = document.documentElement.clientWidth;
        //获取页面路径
        var baseUrl = window.document.location.protocol + "//" + window.document.location.host + "/";
          var shortenedUrl = window.document.location.href.replace(baseUrl, "").replace(////g, "/").replace("//", "/");
          if(shortenedUrl.startsWith("/")){
              shortenedUrl = shortenedUrl.substring(1);
          }
          if(shortenedUrl.indexOf("web/")==0){
              baseUrl = baseUrl + shortenedUrl.substring(0, shortenedUrl.indexOf("/"));
          }
        //在页面未加载完毕之前显示的loading Html自定义内容
        var _LoadingHtml = '<div id="loadingPage" style="position:fixed;left:0;top:0;_position: absolute;100%;height:' + _PageHeight + 'px;background:' + options.backgroundColor + ';opacity:' + options.opacity + ';filter:alpha(opacity=' + options.opacity * 100 + ');z-index:' + options.zindex + 
        ';"><div id="loadingTips" class="loadingTips" style="position: absolute; cursor1: wait; border-color:' + options.borderColor + 
        ';background-position:50%;  '+options.width+';height:'+options.height+';border-style:' + options.borderStyle + ';border-' + options.borderWidth + 'px; line-height:80px; padding: 15px;border-radius:10px;  background: url('+baseUrl+'/images/loading.gif) no-repeat center; color:' + options.TipsColor + ';font-size:20px;">' 
        + options.loadingTips + '</div></div>';

        //呈现loading效果
        $("body").append(_LoadingHtml);
        //获取loading提示框宽高
        var _LoadingTipsH = document.getElementById("loadingTips").clientHeight,
        _LoadingTipsW = document.getElementById("loadingTips").clientWidth;

        //计算距离，让loading提示框保持在屏幕上下左右居中
        var _LoadingTop = _PageHeight > _LoadingTipsH ? (_PageHeight - _LoadingTipsH) / 2 : 0,
        _LoadingLeft = _PageWidth > _LoadingTipsW ? (_PageWidth - _LoadingTipsW) / 2 : 0;

        $(".loadingTips").css({
            "left": _LoadingLeft + "px",
            "top": _LoadingTop + "px"
        });

        //监听页面加载状态
        // document.onreadystatechange = PageLoaded;

        //当页面加载完成后执行
        // function PageLoaded() {
        //     if (document.readyState == "complete") {
        //         var loadingMask = $('#loadingPage');

        //         setTimeout(function () {
        //             loadingMask.animate({
        //                 "opacity": 0
        //             },
        //             options.delayTime,
        //             function () {
        //                 $(this).hide();

        //             });

        //         },
        //         options.sleep);

        //     }
        // }
    },
    end: function () {
        $("#loadingPage").remove();
    }
}
//初始化ajax
$.ajaxSetup({
    beforeSend:function(xhr){
        $.bootstrapLoading.start();
    },
        complete: function () {
            $.bootstrapLoading.end();
        }
});

4、时间格式化

Date.prototype.format=function(fmt) {         
    var o = {         
    "M+" : this.getMonth()+1, //月份         
    "d+" : this.getDate(), //日         
    "h+" : this.getHours()%12 == 0 ? 12 : this.getHours()%12, //小时         
    "H+" : this.getHours(), //小时         
    "m+" : this.getMinutes(), //分         
    "s+" : this.getSeconds(), //秒         
    "q+" : Math.floor((this.getMonth()+3)/3), //季度         
    "S" : this.getMilliseconds() //毫秒         
    };         
    var week = {         
    "0" : "/u65e5",         
    "1" : "/u4e00",         
    "2" : "/u4e8c",         
    "3" : "/u4e09",         
    "4" : "/u56db",         
    "5" : "/u4e94",         
    "6" : "/u516d"        
    };         
    if(/(y+)/.test(fmt)){         
        fmt=fmt.replace(RegExp.$1, (this.getFullYear()+"").substr(4 - RegExp.$1.length));         
    }         
    if(/(E+)/.test(fmt)){         
        fmt=fmt.replace(RegExp.$1, ((RegExp.$1.length>1) ? (RegExp.$1.length>2 ? "/u661f/u671f" : "/u5468") : "")+week[this.getDay()+""]);         
    }         
    for(var k in o){         
        if(new RegExp("("+ k +")").test(fmt)){         
            fmt = fmt.replace(RegExp.$1, (RegExp.$1.length==1) ? (o[k]) : (("00"+ o[k]).substr((""+ o[k]).length)));         
        }         
    }         
    return fmt;         
} 

function getDate(strDate){
    if(strDate && strDate!=""){
        var date = eval('new Date(' + strDate.replace(/d+(?=-[^-]+$)/, function (a) { return parseInt(a, 10) - 1; }).match(/d+/g) + ')');
        return date;
    }
    return undefined;
}

function formatDate(date, fmt){
    var format = fmt || "yyyy-MM-dd hh:mm:ss";
    if(date instanceof Date){
        return date.format(format);
    }else if(typeof date == 'string'){
        var d = getDate(date);
        if(d){
            return d.format(format);
        }
        return '';
    }else{
        return date;
    }
}

 5、格式化数据（树状结构）

TreeDataFormat = {
    format : function(conf) {
        var idField, textField, parentField, iconClsField;
        idField = conf.idField ||  'id';
        textField = conf.textField || 'text';
        parentField = conf.parentField || 'pid';
        iconClsField = conf.iconClsField || 'iconCls';
        data = conf.data
        var i, l, treeData = [], tmpMap = [];
        for (i = 0, l = data.length; i < l; i++) {
            data[i]['id'] = data[i][idField];
            data[i]['text'] = data[i][textField];
            data[i]['pid'] = data[i][parentField];
            data[i]['iconCls'] = data[i][iconClsField] || 'anticon icon-nav';
            data[i]['children'] = [];
            tmpMap[data[i][idField]] = data[i];
        }
        for (i = 0, l = data.length; i < l; i++) {
            if (tmpMap[data[i][parentField]] && data[i][idField] != data[i][parentField]) {
                if (!tmpMap[data[i][parentField]]['children'])
                    tmpMap[data[i][parentField]]['children'] = [];
                data[i][parentField]
                data[i]['text'] = data[i][textField];
                tmpMap[data[i][parentField]]['children'].push(data[i]);
            } else {
                data[i]['text'] = data[i][textField];
                treeData.push(data[i]);
            }
        }
        return treeData;
    },
    getChildrenByPid:function(treeData, pidField, pid, result){
        result = result || [];
        for (var i = 0; i < treeData.length; i++) {
            if (treeData[i][pidField] === pid)
                result.push(treeData[i]);
            else {
                if (treeData[i].hasOwnProperty("children")) {
                    result = this.getChildrenByPid(treeData[i].children, pidField, pid, result);
                }
            }
        }
        return result;
    }    
}