javascript 遍历猫鼬查找结果
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Iterate through mongoose find result
提问by Pio
I have some trouble getting out data from the result of a query in mongoose: here is my function:
我在从 mongoose 中的查询结果中获取数据时遇到了一些麻烦：这是我的函数：
getNinjas : function(res){
var twisted = function(res){
return function(err, data){
if (err){
console.log('error occured');
return;
}
res.send('My ninjas are:\n');
for (var i;i<data.length;i++){
console.log(data[i].name);
}
//I need to process my data one by one here
}
}
Ninja.find({},'name skill',twisted(res));
}
So if I console.log(data)in the getNinjas function, I get the result of my query. How can I access each record one by one? I get nothing in the console like this.
所以如果我console.log(data)在 getNinjas 函数中，我会得到我的查询结果。如何一一访问每条记录？我在控制台中什么也得不到。
回答by robertklep
You forgot to initialize i:
你忘了初始化i：
for (var i = 0;i<data.length;i++){
// ^^^^
console.log(data[i].name);
}
回答by Ali
Since you ask how to access each record one by one, it's good to have forEachin your arsenal other than the standard forloop. Once you've crossed the error checking if:
由于您询问如何逐条访问每条记录，因此forEach除了标准for循环之外，最好在您的武器库中使用。一旦你越过错误检查if：
data.forEach(function(record){
console.log(record.name);
// Do whatever processing you want
});
