在express開發(fā)中,經(jīng)常性碰到個(gè)問(wèn)題:
User.findOne({
userName: userName
}, function (userErr, userDoc) {
if (userErr) {
return res.json({
status: '0',
msg: userErr.message,
result: '查無(wú)此人,可以注冊(cè)'
})
} else {
return res.json({
status: '1',
msg: '查有此人,不可注冊(cè)',
result: 'user-error'
})
}
})
它老是報(bào)這個(gè)錯(cuò)誤:
Error: Can't set headers after they are sent.
請(qǐng)問(wèn)這要如何解決?加return都不行?要怎么操作才行的...
補(bǔ)充:這個(gè)接口的完整代碼:
router.post('/register', function (req, res, next) {
console.log(req.body);
if (req.body) {
//時(shí)間函數(shù)
function CurrentTime() {
var now = new Date();
var year = now.getFullYear(); //年
var month = now.getMonth() + 1; //月
var day = now.getDate(); //日
var hh = now.getHours(); //時(shí)
var mm = now.getMinutes(); //分
var clock = year + "-";
// var clock = '';
if (month < 10)
clock += "0";
clock += month + "-";
if (day < 10)
clock += "0";
clock += day + " ";
if (hh < 10)
clock += "0";
clock += hh + ":";
if (mm < 10) clock += '0';
clock += mm;
return (clock);
};
//驗(yàn)證用戶名是否存在
let userName = req.body.name;
User.findOne({
userName: userName
}, function (userErr, userDoc) {
console.log("userDoc err")
if (userErr) {
console.log("無(wú)此用戶:"+userName);
} else {
res.json({
status: '1',
msg: '查有此人,不可注冊(cè)',
result: 'user-error'
})
return false;
}
})
//驗(yàn)證兩次密碼是否相同并加密密碼
let userPassword = req.body.pass;
let userCheckPassword = req.body.checkPass;
if (userPassword == userCheckPassword) {
//生成口令的散列值
let md5 = crypto.createHash('md5'); //crypto模塊功能是加密并生成各種散列,此處所示為MD5方式加密
let password = md5.update(userPassword).digest('hex'); //加密后的密碼
} else {
console.log("password err")
res.json({
status: '0',
msg: '密碼不一致!',
result: 'password-error'
});
return false;
}
console.log(password);
let param = {
userCreatetime: CurrentTime(),
userName: userName,
userPassword: password,
userHostelArea: req.body.hostelArea,
userHostelAddress: req.body.hostelAddress,
userSex: req.body.sex,
userQQ: req.body.qq,
userState: "1"
};
User.create(param);
res.json({
status: "1",
msg: '創(chuàng)建用戶成功!',
result: 'success'
});
} else {
console.log("req.body error")
res.json({
status: '0',
msg: '拒絕空響!',
result: 'error'
})
return false;
}
})
返回的完整錯(cuò)誤:
GET /users/setSessionStorage 304 8.845 ms - -
GET /hostels 304 41.645 ms - -
{ name: '劍寒秋',
pass: '123456',
checkPass: '123456',
hostelArea: '綠楊樓',
hostelAddress: 'R413',
sex: '男',
qq: '123456' }
POST /users/register 500 26.365 ms - 2258
Error: Failed to lookup view "error" in views directory "E:\畢業(yè)設(shè)計(jì)\ConvenientCampus\server\views"
at Function.render (E:\畢業(yè)設(shè)計(jì)\ConvenientCampus\node_modules\_express@4.15.5@express\lib\application.js:580:17)
at ServerResponse.render (E:\畢業(yè)設(shè)計(jì)\ConvenientCampus\node_modules\_express@4.15.5@express\lib\response.js:971:7)
at E:\畢業(yè)設(shè)計(jì)\ConvenientCampus\server\app.js:89:7
at Layer.handle_error (E:\畢業(yè)設(shè)計(jì)\ConvenientCampus\node_modules\_express@4.15.5@express\lib\router\layer.js:71:5)
at trim_prefix (E:\畢業(yè)設(shè)計(jì)\ConvenientCampus\node_modules\_express@4.15.5@express\lib\router\index.js:315:13)
at E:\畢業(yè)設(shè)計(jì)\ConvenientCampus\node_modules\_express@4.15.5@express\lib\router\index.js:284:7
at Function.process_params (E:\畢業(yè)設(shè)計(jì)\ConvenientCampus\node_modules\_express@4.15.5@express\lib\router\index.js:335:12)
at next (E:\畢業(yè)設(shè)計(jì)\ConvenientCampus\node_modules\_express@4.15.5@express\lib\router\index.js:275:10)
at Layer.handle_error (E:\畢業(yè)設(shè)計(jì)\ConvenientCampus\node_modules\_express@4.15.5@express\lib\router\layer.js:67:12)
at trim_prefix (E:\畢業(yè)設(shè)計(jì)\ConvenientCampus\node_modules\_express@4.15.5@express\lib\router\index.js:315:13)
at E:\畢業(yè)設(shè)計(jì)\ConvenientCampus\node_modules\_express@4.15.5@express\lib\router\index.js:284:7
at Function.process_params (E:\畢業(yè)設(shè)計(jì)\ConvenientCampus\node_modules\_express@4.15.5@express\lib\router\index.js:335:12)
at next (E:\畢業(yè)設(shè)計(jì)\ConvenientCampus\node_modules\_express@4.15.5@express\lib\router\index.js:275:10)
at E:\畢業(yè)設(shè)計(jì)\ConvenientCampus\node_modules\_express@4.15.5@express\lib\router\index.js:635:15
at next (E:\畢業(yè)設(shè)計(jì)\ConvenientCampus\node_modules\_express@4.15.5@express\lib\router\index.js:260:14)
at next (E:\畢業(yè)設(shè)計(jì)\ConvenientCampus\node_modules\_express@4.15.5@express\lib\router\route.js:127:14)
userDoc err
events.js:183
throw er; // Unhandled 'error' event
^
Error: Can't set headers after they are sent.
at validateHeader (_http_outgoing.js:494:11)
at ServerResponse.setHeader (_http_outgoing.js:501:3)
at ServerResponse.header (E:\畢業(yè)設(shè)計(jì)\ConvenientCampus\node_modules\_express@4.15.5@express\lib\response.js:730:10)
at ServerResponse.send (E:\畢業(yè)設(shè)計(jì)\ConvenientCampus\node_modules\_express@4.15.5@express\lib\response.js:170:12)
at ServerResponse.json (E:\畢業(yè)設(shè)計(jì)\ConvenientCampus\node_modules\_express@4.15.5@express\lib\response.js:256:15)
at E:\畢業(yè)設(shè)計(jì)\ConvenientCampus\server\routes\users.js:80:13
at E:\畢業(yè)設(shè)計(jì)\ConvenientCampus\node_modules\_mongoose@5.0.9@mongoose\lib\model.js:3930:16
at Immediate.<anonymous> (E:\畢業(yè)設(shè)計(jì)\ConvenientCampus\node_modules\_mongoose@5.0.9@mongoose\lib\query.js:1514:14)
at Immediate._onImmediate (E:\畢業(yè)設(shè)計(jì)\ConvenientCampus\node_modules\_mquery@3.0.0@mquery\lib\utils.js:119:16)
at runCallback (timers.js:789:20)
at tryOnImmediate (timers.js:751:5)
at processImmediate [as _immediateCallback] (timers.js:722:5)
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