[Vuejs]-Why can't my validator of element-ui-form be called?

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I think the problem might be caused by this line:

if(!res.code==20000){
  // Some stuff here
}

It should probably read:

if(res.code!=20000){
  // Some stuff here
}

!res.code will always evaluate to either true or false. So !res.code==20000 will always be false. No matter the input the following error callback will never execute:

return callback(new Error('the code is wrong or expired'))

Here’s a little demo to show that "bar" will always be printed out

function simple_if(number) {
  if (!number == 20000) {
    return "foo"
  } else {
    return "bar"
  }
}

console.log(`res=20000. Expect 'bar': ${simple_if(2000)}`)
console.log(`res=3. Expect 'foo': ${simple_if(3)}`)
console.log(`res=0. Expect 'foo': ${simple_if(0)}`)

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