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我有以下代码来查找提交表单字段长度的长度。在nodejs中查找表单字段长度
exports.changeStatus = function(req, res) {
res.header("Access-Control-Allow-Origin", "*");
var access_token=req.body.access_token;
var status=req.body.statuse;
var access_token_aray=new Array();
var respon="";
var errorcode="";
connection.query('Select `access_token`,`status` from `userss`',function(err,row,field){
if((access_token.length==0)||(status.length==0)){
respon="Please fill all the fields.";
errorcode=100;
}
/*else if(access_token_aray[access_token]!==1){
respon="Invalid access_token";
errorcode=101;
}
*/
if(errorcode){
respon = {"error" : respon, "error-code" : errorcode};
}
/*
else{
respon = {"log" : 1, "access_token" :access_token };
}
*/
res.send(JSON.stringify(respon,0,4));
});
但它给我下面errror
TypeError: Cannot read property 'length' of undefined
at Query._callback (/home/group3/www/friends/routes/status.js:23:19)
at Query.Sequence.end (/home/group3/www/friends/node_modules/mysql/lib/protocol/sequences/Sequence.js:78:24)
at Query._handleFinalResultPacket (/home/group3/www/friends/node_modules/mysql/lib/protocol/sequences/Query.js:143:8)
at Query.EofPacket (/home/group3/www/friends/node_modules/mysql/lib/protocol/sequences/Query.js:127:8)
at Protocol._parsePacket (/home/group3/www/friends/node_modules/mysql/lib/protocol/Protocol.js:197:24)
at Parser.write (/home/group3/www/friends/node_modules/mysql/lib/protocol/Parser.js:62:12)
at Protocol.write (/home/group3/www/friends/node_modules/mysql/lib/protocol/Protocol.js:37:16)
at Socket.ondata (stream.js:51:26)
at Socket.EventEmitter.emit (events.js:117:20)
at Socket.<anonymous> (_stream_readable.js:720:14)