javascript - How to know when page is ready without using jQuery (alternative way)?

itemprop="text">

If
you have jQuery called in your page. You can simply do
it:

$(document).ready(function()
            { /** code inside
            **/});

But how to do
similar thing without jQuery?

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class="normal">Answer

You can
use the DOMContentLoaded
event.

document.addEventListener('DOMContentLoaded',
            function() {
 //
            ...

});

Note
that in older IEs you need workarounds, some use the
readystatechange event if I recall
correctly.