Make the background through javascript

I want to put the background after you downlo开发者_开发百科ad the entire code and files in html. It can however be done. Make it so that the background is loaded after all the content.

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Set it after the DOM loads:

$(function() {
    $("body").css("background-color", "red");
});

or after the whole page (e.g. images) has loaded:

$(window).load(function() {
    $("body").css("background-color", "red");
});  

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If by background you mean a background image:

$(function(){
    $('body').css('background','url(\'url-to-background-image\')');
});