如何在同一功能中使用不同的uri
我正在尝试通过url创建下载功能
在HTML中有3个按钮(下载,暂停,重启)调用download_file(),pause22(),restart_test()。
它们使用在download_file()中声明的相同变量[req],其中包含一个请求对象。
它工作正常如果我只打一次电话。
但问题是我需要制作下载列表。所以每个download_file()都需要使用不同的URL,用户可以多次同时调用它。当请求结束时,还需要在单击的按钮上显示消息。
我可以重用功能吗?
如果我通过url创建每个不同的函数,那将是愚蠢的。
我怎么能区分点击的内容?
JS
function download_file(event, fileURL) {
req = request({
method: 'GET',
uri: fileURL,
});
var out = fs.createWriteStream(finalPath);
req.pipe(out);
req.on('data', function(chunk) {
received_bytes += chunk.length;
});
req.on('end', function() {
subW = test.substring(9, 18).trim();
$("." + subW).text('finished');
endV = 2;
});
}
//resume function
function restart_test() {
req = request({
method: 'GET',
uri: fileURL
});
var out = fs.createWriteStream(finalPath);
req.pipe(out);
req.on('data', function(chunk) {
received_bytes += chunk.length;
});
req.on('end', function() {
subW = test.substring(9, 18).trim();
$("." + subW).text('finished');
endV = 2;
});
}
//pause
$('#btn-pause').click(function(e) {
console.log('pause function called');
req.pause();
});
HTML
<tr>
<td class="test"><a class="checkBtn checkBtn2" onclick="download_file(event, '100mb.bin')">download</a></td>
<td><a class="pauseBtn pauseBtn2" id="btn-pause" value="ACTION">pause</a><a class="resumeBtn resumeBtn2" onclick="restart_test();" value="ACTION">restart</a></td>
</tr>
<tr>
<td class="test"><a class="checkBtn checkBtn2" onclick="download_file(event, '1000mb.bin')">download</a></td>
<td><a class="pauseBtn pauseBtn2" id="btn-pause" value="ACTION">pause</a><a class="resumeBtn resumeBtn2" onclick="restart_test();" value="ACTION">restart</a></td>
</tr>
回答如下:
我认为你应该将req保存到对象中。
JS
var listReqs = {};
function download_file(event, filename) {
var req = request({
method: 'GET',
uri: fileURL,
});
var out = fs.createWriteStream(finalPath);
req.pipe(out);
req.on('data', function(chunk) {
received_bytes += chunk.length;
});
req.on('end', function() {
subW = test.substring(9, 18).trim();
$("." + subW).text('finished');
endV = 2;
});
listReqs[filename] = req;
}
//resume function
function restart_test(filename) {
var req = listReqs[filename];
var out = fs.createWriteStream(final path);
req.pipe(out);
req.on('data', function(chunk) {
received_bytes += chunk.length;
});
req.on('end', function() {
subW = test.substring(9, 18).trim();
$("." + subW).text('finished');
endV = 2;
});
}
//pause
$('.pauseBtn2').click(function(e) {
console.log('pause function called');
var filename = $(this).attr('filename');
listReqs[filename].pause();
});
Html
<tr>
<td class="test"><a class="checkBtn checkBtn2" onclick="download_file(event, '100mb.bin')">download</a></td>
<td><a class="pauseBtn pauseBtn2" filename="100mb.bin" value="ACTION">pause</a><a class="resumeBtn resumeBtn2" onclick="restart_test('100mb.bin');" value="ACTION">restart</a></td>
</tr>
<tr>
<td class="test"><a class="checkBtn checkBtn2" onclick="download_file(event, '1000mb.bin')">download</a></td>
<td><a class="pauseBtn pauseBtn2" filename="1000mb.bin" value="ACTION">pause</a><a class="resumeBtn resumeBtn2" onclick="restart_test('1000mb.bin');" value="ACTION">restart</a></td>
</tr>