[英]How to fix undefined error handling node.js
const fs = require('fs');
const fileName = './prices.json';
const file = require(fileName);
const price = require('./prices.json');
const fileName = './prices.json';
if(tmd = message.match(/^!change max (\D+)/)) {
if(steamID == config.ownerID){
var kak = tmd[1];
var sellu = 0;
sellp = parseInt(message.replace("!change max "+kak,''));
selli = message.replace("!change max ",'')
selli = selli.replace(" "+sellp,'')
if (file[selli].max !== undefined){
file[selli].max = sellp;
fs.writeFile(fileName, JSON.stringify(file), function writeJSON(err) {
if (err) return console.log(err);
client.chatMessage(steamID,"Succesfully changed max of " + selli)
});
}else{
client.chatMessage(steamID,"There was an problem in changing, you might put wrongly name remember about capital letters or\n just do !list and ctrl+c ctrl+v")
}
}
}
UnhandledPromiseRejectionWarning: TypeError: 無法讀取未定義的屬性“max”
出於某種原因不想在其 undefiend 時跳過錯誤
您需要先檢查 file[selli] 是否未定義。 否則你會在你的 if 條件中得到一個錯誤。
代替
if (file[selli].max !== undefined){
為了
if (typeof file[selli] !== 'undefined' && typeof file[selli].max !== 'undefined' ) {
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