好的，这就是应该做的工作。将来可能对某人有用。：
(function( $ ){
$.fn.videoBG = function( selector, options ) {
var options = {};
if (typeof selector == "object") {
options = $.extend({}, $.fn.videoBG.defaults, selector);
}
else if (!selector) {
options = $.fn.videoBG.defaults;
}
else {
return $(selector).videoBG(options);
}
var container = $(this);
// check if elements available otherwise it will cause issues
if (!container.length)
return;
// container to be at least relative
if (container.css('position') == 'static' || !container.css('position'))
container.css('position','relative');
// we need a width
if (options.width == 0)
options.width = container.width();
// we need a height
if (options.height == 0)
options.height = container.height();
// get the wrapper
var wrap = $.fn.videoBG.wrapper();
wrap.height(options.height)
.width(options.width);
// if is a text replacement
if (options.textReplacement) {
// force sizes
options.scale = true;
// set sizes and forcing text out
container.width(options.width)
.height(options.height)
.css('text-indent','-9999px');
}
else {
// set the wrapper above the video
wrap.css('z-index',options.zIndex+1);
}
// move the contents into the wrapper
wrap.html(container.clone(true));
// get the video
var video = $.fn.videoBG.video(options);
// if we are forcing width / height
if (options.scale) {
// overlay wrapper
wrap.height(options.height)
.width(options.width);
// video
video.height(options.height)
.width(options.width);
}
// add it all to the container
container.html(wrap);
container.append(video);
return video.find("video")[0];
}
// set to fullscreen
$.fn.videoBG.setFullscreen = function($el) {
var windowWidth = $(window).width(),
windowHeight = $(window).height();
$el.css('min-height',0).css('min-width',0);
$el.parent().width(windowWidth).height(windowHeight);
// if by width
if (windowWidth / windowHeight > $el.aspectRatio) {
$el.width(windowWidth).height('auto');
// shift the element up
var height = $el.height();
var shift = (height - windowHeight) / 2;
if (shift < 0) shift = 0;
$el.css("top",-shift);
} else {
$el.width('auto').height(windowHeight);
// shift the element left
var width = $el.width();
var shift = (width - windowWidth) / 2;
if (shift < 0) shift = 0;
$el.css("left",-shift);
// this is a hack mainly due to the iphone
if (shift === 0) {
var t = setTimeout(function() {
$.fn.videoBG.setFullscreen($el);
},500);
}
}
$('body > .videoBG_wrapper').width(windowWidth).height(windowHeight);
}
// get the formatted video element
$.fn.videoBG.video = function(options) {
$('html, body').scrollTop(-1);
// video container
var $div = $('<div/>');
$div.addClass('videoBG')
.css('position',options.position)
.css('z-index',options.zIndex)
.css('top',0)
.css('left',0)
.css('height',options.height)
.css('width',options.width)
.css('opacity',options.opacity)
.css('overflow','hidden');
// video element
var $video = $('<video/>');
$video.css('position','absolute')
.css('z-index',options.zIndex)
.attr('poster',options.poster)
.css('top',0)
.css('left',0)
.css('min-width','100%')
.css('min-height','100%');
if (options.autoplay) {
$video.attr('autoplay',options.autoplay);
}
// if fullscreen
if (options.fullscreen) {
$video.bind('canplay',function() {
// set the aspect ratio
$video.aspectRatio = $video.width() / $video.height();
$.fn.videoBG.setFullscreen($video);
})
// listen out for screenresize
var resizeTimeout;
$(window).resize(function() {
clearTimeout(resizeTimeout);
resizeTimeout = setTimeout(function() {
$.fn.videoBG.setFullscreen($video);
},100);
});
$.fn.videoBG.setFullscreen($video);
}
// video standard element
var v = $video[0];
// if meant to loop
if (options.loop) {
loops_left = options.loop;
// cant use the loop attribute as firefox doesnt support it
$video.bind('ended', function(){
// if we have some loops to throw
if (loops_left)
// replay that bad boy
v.play();
// if not forever
if (loops_left !== true)
// one less loop
loops_left--;
});
}
// when can play, play
$video.bind('canplay', function(){
if (options.autoplay)
// replay that bad boy
v.play();
});
// if supports video
if ($.fn.videoBG.supportsVideo()) {
// supports webm
if ($.fn.videoBG.supportType('webm')){
// play webm
$video.attr('src',options.webm);
}
// supports mp4
else if ($.fn.videoBG.supportType('mp4')) {
// play mp4
$video.attr('src',options.mp4);
// $video.html('<source src="'.options.mp4.'" />');
}
// throw ogv at it then
else {
// play ogv
$video.attr('src',options.ogv);
}
}
// image for those that dont support the video
var $img = $('<img/>');
$img.attr('src',options.poster)
.css('position','absolute')
.css('z-index',options.zIndex)
.css('top',0)
.css('left',0)
.css('min-width','100%')
.css('min-height','100%');
// add the image to the video
// if suuports video
if ($.fn.videoBG.supportsVideo()) {
// add the video to the wrapper
$div.html($video);
}
// nope - whoa old skool
else {
// add the image instead
$div.html($img);
}
// if text replacement
if (options.textReplacement) {
// force the heights and widths
$div.css('min-height',1).css('min-width',1);
$video.css('min-height',1).css('min-width',1);
$img.css('min-height',1).css('min-width',1);
$div.height(options.height).width(options.width);
$video.height(options.height).width(options.width);
$img.height(options.height).width(options.width);
}
if ($.fn.videoBG.supportsVideo()) {
v.play();
}
return $div;
}
// check if suuports video
$.fn.videoBG.supportsVideo = function() {
return (document.createElement('video').canPlayType);
}
// check which type is supported
$.fn.videoBG.supportType = function(str) {
// if not at all supported
if (!$.fn.videoBG.supportsVideo())
return false;
// create video
var v = document.createElement('video');
// check which?
switch (str) {
case 'webm' :
return (v.canPlayType('video/webm; codecs="vp8, vorbis"'));
break;
case 'mp4' :
return (v.canPlayType('video/mp4; codecs="avc1.42E01E, mp4a.40.2"'));
break;
case 'ogv' :
return (v.canPlayType('video/ogg; codecs="theora, vorbis"'));
break;
}
// nope
return false;
}
// get the overlay wrapper
$.fn.videoBG.wrapper = function() {
var $wrap = $('<div/>');
$wrap.addClass('videoBG_wrapper')
.css('position','absolute')
.css('top',0)
.css('left',0);
return $wrap;
}
// these are the defaults
$.fn.videoBG.defaults = {
mp4:'',
ogv:'',
webm:'',
poster:'',
autoplay:true,
loop:true,
scale:false,
position:"absolute",
opacity:1,
textReplacement:false,
zIndex:0,
width:0,
height:0,
fullscreen:false,
imgFallback:true
}
})( jQuery );
$(document).ready(function() {
$('body').videoBG({
position:"fixed",
zIndex:0,
mp4:'http://www.pete.dj/video/video.mp4',
ogv:'http://www.pete.dj/video/video.ogv',
webm:'http://www.pete.dj/video/video.webm',
poster:'http://www.pete.dj/video/video.jpg',
opacity:1,
fullscreen:true,
});
})
jfiddle在这里：
jfiddle