H5单页面系统开发，动态加载js

var i93comm = {};
//动态加载一个js/css文件
i93comm.loadjscssfile=function(filename, filetype) {
    if (filetype == "js") {
        var fileref = document.createElement('script');
        fileref.setAttribute("type", "text/javascript");
        fileref.setAttribute("src", filename);
        document.getElementsByTagName("body")[0].appendChild(fileref);
    }
    else if (filetype == "css") {
        var fileref = document.createElement("link");
        fileref.setAttribute("rel", "stylesheet");
        fileref.setAttribute("type", "text/css");
        fileref.setAttribute("href", filename);
        document.getElementsByTagName("head")[0].appendChild(fileref);
    }
}

//移动已经加载过的js/css
i93comm.removejscssfile=function(filename, filetype) {
    var targetelement = (filetype == "js") ? "script" : (filetype == "css") ? "link" : "none";
    var targetattr = (filetype == "js") ? "src" : (filetype == "css") ? "href" : "none";
    var allsuspects = document.getElementsByTagName(targetelement);
    for (var i = allsuspects.length; i >= 0; i--) {
        if (allsuspects[i] && allsuspects[i].getAttribute(targetattr) != null && allsuspects[i].getAttribute(targetattr).indexOf(filename) != -1)
            allsuspects[i].parentNode.removeChild(allsuspects[i]);
    }
}

//替换已经加载的js / css文件，代码如下：
i93comm.createjscssfile = function (filename, filetype) {
    if (filetype == "js") {
        var fileref = document.createElement('script');
        fileref.setAttribute("type", "text/javascript");
        fileref.setAttribute("src", filename);
    }
    else if (filetype == "css") {
        var fileref = document.createElement("link");
        fileref.setAttribute("rel", "stylesheet");
        fileref.setAttribute("type", "text/css");
        fileref.setAttribute("href", filename);
    }
    return fileref;
}
    
i93comm.replacejscssfile = function (oldfilename, newfilename, filetype) {
    var targetelement = (filetype == "js") ? "script" : (filetype == "css") ? "link" : "none";
    var targetattr = (filetype == "js") ? "src" : (filetype == "css") ? "href" : "none";
    var allsuspects = document.getElementsByTagName(targetelement);
    for (var i = allsuspects.length; i >= 0; i--) {
        if (allsuspects[i] && allsuspects[i].getAttribute(targetattr) != null && allsuspects[i].getAttribute(targetattr).indexOf(oldfilename) != -1) {
            var newelement = i93comm.createjscssfile(newfilename, filetype);
            allsuspects[i].parentNode.replaceChild(newelement, allsuspects[i]);
        }
    }
}

routes: [
        {
            path: '/procurement/declare/',
            url: '/pages/procurement/declare.html',
            on: {
                pageInit: function (event, page) {
                    i93comm.loadjscssfile("js/procurement/declare.js?v=0.2", "js");
                },
                pageBeforeIn: function (event, page) {
                },
                pageAfterIn: function (event, page) {
                    getDepartmentList();
                },
                pageBeforeRemove: function (event, page) {
                    i93comm.removejscssfile("js/procurement/declare.js?v=0.2", "js");
                },
            }
        },
        {
            path: '/procurement/approval/',
            url: '/pages/procurement/approval.html',
        },
    ],