how to get appends objects code example

Example 1: javascript append to object

var alerts = [ 
    {num : 1, app:'helloworld',message:'message'},
    {num : 2, app:'helloagain',message:'another message'} 
]

Example 2: javascript append to object

alerts.push({num : 3, app:'helloagain_again',message:'yet another message'});