编写 PhoneGap 程序调试问题解决方案

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/*
用户登录模块

params = {};
params.username 登录用户名
params.password 登录用户密码

succcb  登录成功时候的回调函数 function(data);
errcb   登录失败时候的回调函数 function(text);
*/
function bb_login(params, succcb, errcb)
{
var tmplate = login_req_xml(params);

doPost(tmplate, function(data, textStatus, jqXHR) {
if (data.status == 0) {
errcb(data.info);
} else {
GServerData.curToken = data.data;
succcb(data.data);
}
}, function(jqXHR, textStatus, errorThrown) {
errcb(textStatus);
});
}

/*用户登录的模板文件*/
function login_req_xml(params)
{
var tmplate = '<?xml version="1.0" encoding="utf-8"?>'
+ '<request>'
+ '<operation>'
+ '<module>token</module>'
+ '<action>login</action>'
+ '<params>'
+ '<username>' + params.username + '</username>'
+ '<password>' + params.password + '</password>'
+ '</params>'
+ '</operation>'
+ '</request>';
return  tmplate;
}

/*
向服务器发送 POST 请求.

data: 向服务器发送的数据内容
succcb: 成功时候的回调函数 success(data, textStatus, jqXHR)
errcb:  失败时候的回调函数 error(jqXHR, textStatus, errorThrown)
*/
function doPost(data, succcb, errcb)
{
$.ajax({
type: "POST",
url: Config.serverapi,
data: data,
cache: false,
dataType: "json",
success: succcb,
error: errcb
});
}

b.  数据缓存

/*
dataUrl 请求数据的网络URL地址
如果缓存成功，则会返回本地的File地址

succcb 登录成功时候的回调函数 function(data);
errcb 登录失败时候的回调函数 function(text);
*/
function bb_loadCacheData(dataurl, succcb, errcb)
{
var errorCB = function (err) {
console.log("Error processing : " + err.code);
errcb("Error processing : " + err.code);
}

var downLoadFile = function(db) {
console.log("downLoadFile ... [" + dataurl + "]");

//特别备注：在Phonegap1.5.0中，LocalFileSystem.TEMPORARY 和 LocalFileSystem.PERSISTENT 两者相反了
window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, function (fileSystem) {
var datadate = new Date().getTime();
var filename = datadate + '_' + dataurl.substr(dataurl.lastIndexOf('/')+1);

var fileTransfer = new FileTransfer();

fileTransfer.download(
dataurl,
fileSystem.root.fullPath.substr("file://".length) + Config.datacachepath + filename,
function(entry) {
console.log("download complete: " + entry.fullPath);
db.transaction(function (tx) {
tx.executeSql('INSERT INTO data_cache (dataurl, datapath, datadate) VALUES ("' + dataurl + '","' + entry.fullPath + '","' + datadate + '")');
succcb(entry.fullPath);
}, errorCB);
},
function(error) {
console.log("download error source " + error.source);
console.log("download error target " + error.target);
console.log("download error code " + error.code);
errcb("download error code " + error.code);
}
);
}, errorCB);
};

var db = window.openDatabase("cache.db", "1.0", "BBShow Data Cache DB", 200000);
db.transaction(function (tx) {
tx.executeSql('CREATE TABLE IF NOT EXISTS data_cache (id unique, dataurl, datapath, datadate)');
tx.executeSql('SELECT * FROM data_cache WHERE dataurl=?', [dataurl], function(tx, results) {
if (results.rows.length > 0) {
window.resolveLocalFileSystemURI(results.rows.item(0).datapath, function(fileEntry) {
console.log(fileEntry.fullPath);
succcb(fileEntry.fullPath);
}, function(error) {
console.log("Unable to resolveLocalFileSystemURI: " + error.code);
db.transaction(function (tx) {
tx.executeSql('DELETE FROM data_cache WHERE dataurl=?', [dataurl]);
downLoadFile(db);
}, errorCB);
});
} else {
downLoadFile(db);
}
}, errorCB);
}, errorCB);
}