mui中判断网络连接和监听变化的代码段

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//获取当前设备的网络类型function plusReady() {    var types = {};    types[plus.networkinfo.CONNECTION_UNKNOW] = "Unknown connection";    types[plus.networkinfo.CONNECTION_NONE] = "None connection";    types[plus.networkinfo.CONNECTION_ETHERNET] = "Ethernet connection";    types[plus.networkinfo.CONNECTION_WIFI] = "WiFi connection";    types[plus.networkinfo.CONNECTION_CELL2G] = "Cellular 2G connection";    types[plus.networkinfo.CONNECTION_CELL3G] = "Cellular 3G connection";    types[plus.networkinfo.CONNECTION_CELL4G] = "Cellular 4G connection";    alert("Network: " + types[plus.networkinfo.getCurrentType()]);}if (window.plus) {    plusReady();} else {    document.addEventListener("plusready", plusReady, false);}

mui.plusReady(function() {    document.addEventListener("netchange", onNetChange, false);    //获取当前网络类型    function onNetChange() {        var nt = plus.networkinfo.getCurrentType();        switch (nt) {            case plus.networkinfo.CONNECTION_ETHERNET:            case plus.networkinfo.CONNECTION_WIFI:                mui.toast("当前网络为WiFi");                break;            case plus.networkinfo.CONNECTION_CELL2G:            case plus.networkinfo.CONNECTION_CELL3G:            case plus.networkinfo.CONNECTION_CELL4G:                mui.toast("当前网络非WiFi");                break;            default:                mui.toast("当前没有网络");                break;        }    }});

// 这段代码有疑问，plus.networkinfo.getCurrentType()的值出来是数字吗？且在这放着document.addEventListener("netchange", function() {    var network = plus.networkinfo.getCurrentType();    if(network < 2) {        if(this.network > 1) {            plus.nativeUI.toast('您的网络已断开', undefined, '期待乐');        }    }    if(this.network == 3 && network > 3) {        plus.nativeUI.toast('您网络已从wifi切换到蜂窝网络，浏览会产生流量', undefined, '期待乐', '我知道了');    }    this.network=network;});