Question

现在我有一个页面可以打开并读取excel表格并根据我拥有的index.jade文件处理这些数据。我希望能够为其他路由器页面重复使用完全相同的代码，并且只对每个页面更改Excel工作表，以便根据不同的Excel工作表显示数据。

因此我可能只需将此代码转换为可在每个router.get函数中使用的函数，而不仅仅是主页。

router.get('/homepage', function(req, res) {

 var workbook= xlsx.readFile('C:\Users\user\Desktop\homepage.xlsx');

  var listStuff = [];
  results1 = [];
  results2 = [];
  results3 = [];

 _.each(workbook.SheetNames, function(value, key, collection) {

listStuff.push(value);

var address_of_cell = 'O3'
var worksheet = workbook.Sheets[value];
var desired_cell = worksheet[address_of_cell];
var percent_1 = desired_cell.v;

results1.push(percent_1)

var address_of_cell = 'P3'
var worksheet = workbook.Sheets[value];
var desired_cell = worksheet[address_of_cell];
var percent_2 = desired_cell.v;

results2.push(percent_2)

var address_of_cell = 'Q3'
var worksheet = workbook.Sheets[value];
var desired_cell = worksheet[address_of_cell];
var percent_3 = desired_cell.v;

results3.push(percent_3)
})

res.render('index', { title: 'Blah Blah', listStuff: listStuff, workbook: workbook, percentofData: results1, percentofData2: results2,   percentofData3: results3});
});

所以我想要更多像上面那样使用相同代码的页面，其中只有excel表的位置会在页面之间发生变化。如何将上述代码转换为可以在接下来的几页中重复使用的函数？：

router.get('/page2', function(req, res) {
  var workbook= xlsx.readFile('C:\Users\user\Desktop\page1.xlsx');
  res.send('HelloWorld')
})

router.get('/page3', function(req, res) {
  var workbook= xlsx.readFile('C:\Users\user\Desktop\page2.xlsx');
  res.send('HelloWorld')
})

router.get('/page4', function(req, res) {
  var workbook= xlsx.readFile('C:\Users\user\Desktop\page3.xlsx');
  res.send('HelloWorld')
})

等.... 因此我需要excel工作簿变量从homepage.xlsx更改为page1.xlsx，page2.xlsx，page3.xlsx等。在函数中。我希望这一切都在同一个index.js文件中完成。

Answer 1

如果将所有重复逻辑移动到函数中怎么样：

function processXLSXFile(filePath) {
  var workbook= xlsx.readFile(filePath);

  var listStuff = [];
  results1 = [];
  results2 = [];
  results3 = [];

 _.each(workbook.SheetNames, function(value, key, collection) {

  listStuff.push(value);

  var address_of_cell = 'O3'
  var worksheet = workbook.Sheets[value];
  var desired_cell = worksheet[address_of_cell];
  var percent_1 = desired_cell.v;

  results1.push(percent_1)

  var address_of_cell = 'P3'
  var worksheet = workbook.Sheets[value];
  var desired_cell = worksheet[address_of_cell];
  var percent_2 = desired_cell.v;

  results2.push(percent_2)

  var address_of_cell = 'Q3'
  var worksheet = workbook.Sheets[value];
  var desired_cell = worksheet[address_of_cell];
  var percent_3 = desired_cell.v;

  results3.push(percent_3)
  })

  return {
    listStuff: listStuff,
    results1: results1,
    results2: results2,
    results3: results3
  };
}

然后您可以在路由处理程序中重复使用它：

router.get('/homepage', function(req, res) {
  var result = processXLSXFile('C:\Users\user\Desktop\homepage.xlsx');
  var listStuff = result.listStuff;
  var workbook = result.workbook;
  var results1 = result.results1;
  var results2 = result.results2;
  var results3 = result.results3;

  res.render('index', { title: 'Blah Blah', listStuff: listStuff, workbook: workbook, percentofData: results1, percentofData2: results2,   percentofData3: results3});
});


router.get('/page2', function(req, res) {
  var result = processXLSXFile('C:\Users\user\Desktop\page1.xlsx');
  var listStuff = result.listStuff;
  var workbook = result.workbook;
  var results1 = result.results1;
  var results2 = result.results2;
  var results3 = result.results3;

  res.send('HelloWorld')
})

router.get('/page3', function(req, res) {
  var result = processXLSXFile('C:\Users\user\Desktop\page2.xlsx');
  var listStuff = result.listStuff;
  var workbook = result.workbook;
  var results1 = result.results1;
  var results2 = result.results2;
  var results3 = result.results3;

  res.send('HelloWorld')
})

router.get('/page4', function(req, res) {
  var result = processXLSXFile('C:\Users\user\Desktop\page3.xlsx');
  var listStuff = result.listStuff;
  var workbook = result.workbook;
  var results1 = result.results1;
  var results2 = result.results2;
  var results3 = result.results3;

  res.send('HelloWorld')
})

希望这可以帮助您解决疑问。

Answer 2

如果您允许使用＆＃39; / page / 2＆＃39;，＆＃39; / page / 3＆＃39;等网址。等等... 我建议你这样做：

router.get('/page/:id', function(req, res) {
  // do whatever validation test you need with req.params.id

  // then 
  var workbook= xlsx.readFile('C:\Users\user\Desktop\page' + req.params.id + '.xlsx');
  res.send('HelloWorld')
})

对各种Express路线使用相同的功能

2 个答案: