When b!=c it is suppose to show "wrong" in the output

Question

var a= document.getElementsByClassName("first")
var b=prompt ("your password")
var c=prompt("retype password")
if(c!=b)
document.write(a)
//it shows [Object html collection]

Answer 1

use document.body.appendChild(a)

it happen because write() treat the parameter as String, where in your code a is not String but a html object collection