uniqid() in javascript/jquery?

Question

what\'s the equivalent of this function in javascript:

http://php.net/manual/en/function.uniqid.php

Basically I need to generate a random ID that looks like:

Answer 1

Underscore.js has a uniqueid() method
https://underscorejs.org/#uniqueId

_.uniqueId([prefix])
Generate a globally-unique id for client-side models or DOM elements that need one. If prefix is passed, the id will be appended to it.

_.uniqueId('contact_');  
=> 'contact_104'