express中url的參數傳遞和獲取

1,傳統get參數

瀏覽器通過這種形式的url訪問localhost/userlist?id=xxx&name=yyy，這種方式可以通過req.query.id獲取參數的值

router.get('/userlist/', function(req, res, next) {
    var fs = require("fs");
    var logstr = JSON.stringify({url:req.path});
    fs.writeFile('log.txt',logstr,'utf-8',function (err) {
        !err && console.log('文件寫入成功id='+req.query.id+'name='+req.query.name);
    });
    var str = req.originalUrl;
    res.send(str);
});

2,占位符傳參

這種形式瀏覽器必須嚴格按照localhost/userlist/xxx/yyy的形式訪問,如果少傳一個參數就會報404錯誤，通過req.params.id獲取對應的參數的值

router.get('/userlist/:id/:name', function(req, res, next) {
    var fs = require("fs");
    var logstr = JSON.stringify({url:req.path});
    fs.writeFile('log.txt',logstr,'utf-8',function (err) {
        !err && console.log('文件寫入成功id='+req.params.id+'name='+req.params.name);
    });
    var str = req.originalUrl;
    res.send(str);
});