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）

 1 jQuery.bootstrapLoading = {
 2     start: function (options) {
 3         var defaults = {
 4             opacity: 1,
 5             //loading页面透明度
 6             backgroundColor: "rgba(0,0,0,0.3)",
 7             //loading页面背景色
 8             borderColor: "#bbb",
 9             //提示边框颜色
10             borderWidth: 0,
11             //提示边框宽度
12             borderStyle: "solid",
13             //提示边框样式
14             loadingTips: "",
15             //提示文本
16             TipsColor: "#666",
17             //提示颜色
18             delayTime: 1000,
19             //页面加载完成后，加载页面渐出速度
20             zindex: 99999999,
21             //loading页面层次
22             sleep: 0,
23             //设置挂起,等于0时则无需挂起
24              '150px',
25             height: '165px',
26         }
27         var options = $.extend(defaults, options);
28 
29         //获取页面宽高
30         var _PageHeight = document.documentElement.clientHeight,
31         _PageWidth = document.documentElement.clientWidth;
32         //获取页面路径
33         var baseUrl = window.document.location.protocol + "//" + window.document.location.host + "/";
34           var shortenedUrl = window.document.location.href.replace(baseUrl, "").replace(////g, "/").replace("//", "/");
35           if(shortenedUrl.startsWith("/")){
36               shortenedUrl = shortenedUrl.substring(1);
37           }
38           if(shortenedUrl.indexOf("web/")==0){
39               baseUrl = baseUrl + shortenedUrl.substring(0, shortenedUrl.indexOf("/"));
40           }
41         //在页面未加载完毕之前显示的loading Html自定义内容
42         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 + 
43         ';"><div id="loadingTips" class="loadingTips" style="position: absolute; cursor1: wait; border-color:' + options.borderColor + 
44         ';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;">' 
45         + options.loadingTips + '</div></div>';
46 
47         //呈现loading效果
48         $("body").append(_LoadingHtml);
49         //获取loading提示框宽高
50         var _LoadingTipsH = document.getElementById("loadingTips").clientHeight,
51         _LoadingTipsW = document.getElementById("loadingTips").clientWidth;
52 
53         //计算距离，让loading提示框保持在屏幕上下左右居中
54         var _LoadingTop = _PageHeight > _LoadingTipsH ? (_PageHeight - _LoadingTipsH) / 2 : 0,
55         _LoadingLeft = _PageWidth > _LoadingTipsW ? (_PageWidth - _LoadingTipsW) / 2 : 0;
56 
57         $(".loadingTips").css({
58             "left": _LoadingLeft + "px",
59             "top": _LoadingTop + "px"
60         });
61 
62         //监听页面加载状态
63         // document.onreadystatechange = PageLoaded;
64 
65         //当页面加载完成后执行
66         // function PageLoaded() {
67         //     if (document.readyState == "complete") {
68         //         var loadingMask = $('#loadingPage');
69 
70         //         setTimeout(function () {
71         //             loadingMask.animate({
72         //                 "opacity": 0
73         //             },
74         //             options.delayTime,
75         //             function () {
76         //                 $(this).hide();
77 
78         //             });
79 
80         //         },
81         //         options.sleep);
82 
83         //     }
84         // }
85     },
86     end: function () {
87         $("#loadingPage").remove();
88     }
89 }
90 //初始化ajax
91 $.ajaxSetup({
92     beforeSend:function(xhr){
93         $.bootstrapLoading.start();
94     },
95         complete: function () {
96             $.bootstrapLoading.end();
97         }
98 });

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）

 1 TreeDataFormat = {
 2     format : function(conf) {
 3         var idField, textField, parentField, iconClsField;
 4         idField = conf.idField ||  'id';
 5         textField = conf.textField || 'text';
 6         parentField = conf.parentField || 'pid';
 7         iconClsField = conf.iconClsField || 'iconCls';
 8         data = conf.data
 9         var i, l, treeData = [], tmpMap = [];
10         for (i = 0, l = data.length; i < l; i++) {
11             data[i]['id'] = data[i][idField];
12             data[i]['text'] = data[i][textField];
13             data[i]['pid'] = data[i][parentField];
14             data[i]['iconCls'] = data[i][iconClsField] || 'anticon icon-nav';
15             data[i]['children'] = [];
16             tmpMap[data[i][idField]] = data[i];
17         }
18         for (i = 0, l = data.length; i < l; i++) {
19             if (tmpMap[data[i][parentField]] && data[i][idField] != data[i][parentField]) {
20                 if (!tmpMap[data[i][parentField]]['children'])
21                     tmpMap[data[i][parentField]]['children'] = [];
22                 data[i][parentField]
23                 data[i]['text'] = data[i][textField];
24                 tmpMap[data[i][parentField]]['children'].push(data[i]);
25             } else {
26                 data[i]['text'] = data[i][textField];
27                 treeData.push(data[i]);
28             }
29         }
30         return treeData;
31     },
32     getChildrenByPid:function(treeData, pidField, pid, result){
33         result = result || [];
34         for (var i = 0; i < treeData.length; i++) {
35             if (treeData[i][pidField] === pid)
36                 result.push(treeData[i]);
37             else {
38                 if (treeData[i].hasOwnProperty("children")) {
39                     result = this.getChildrenByPid(treeData[i].children, pidField, pid, result);
40                 }
41             }
42         }
43         return result;
44     }    
45 }
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原文地址：https://www.cnblogs.com/cutone/p/7125507.html