PC适配及背景图片自适应

zoomForJQuery('.zoom',1);

function zoomForJQuery(eleStr, zoom, center) {
eleStr = eleStr||'.zoom';
if ($(eleStr).length == 0)throw 'DOM is not find';
this.eleArr = $(eleStr);
this.zoom = zoom || 1;
this.center = center === false ? false : true;
this.isZoom = window.navigator.userAgent.search(/Trident|Chrome/) >= 0 ? true : false;
this.isChrome = window.navigator.userAgent.search(/Chrome/) >= 0 ? true : false;
for(var i=0;i < this.eleArr.length; i++){
this.eleArr[i].initW = this.eleArr.eq(i).width();
this.eleArr[i].initH = this.eleArr.eq(i).height();
}
var _this = this;
if(!_this.center){
$('html,body').css({'overflow':'auto','overflow-x':'hidden'});
$('body').css({'overflow-y':'scroll'});
}
this.zoomCtr = function () {
bg_size();
for (var i = 0; i < _this.eleArr.length; i++) {
var parent = $(_this.eleArr[i]).parent();
var current = $(_this.eleArr[i]);
var parentW = parent.width();
var parentH = parent.height();
var currentW = current[0].initW;
var currentH = current[0].initH;
var zoom = null;
zoom = _this.zoom * (parentW / currentW+parentH / currentH)/2;
if(!_this.center){
zoom = _this.zoom * (parentW / currentW);
}
if (_this.isZoom) {
current.css({
position: 'relative',
top: 0,
left: 0,
marginTop: 0,
marginLeft: 0,
zoom: zoom
});
if (_this.center) {
current.css({position: 'absolute',top: '50%',left: '50%', marginLeft: _this.isChrome?-currentW / 2:(-currentW / 2) * zoom, marginTop: _this.isChrome?-currentH / 2:(-currentH / 2) * zoom});
}else{

if(parent[0].tagName == 'BODY' || parent[0].tagName == 'HTML')console.warn('zoomForJQuery:Parent element cannot be BODY or HTML,Not supported IE!!');
else{
parent.css({position: 'absolute', top: 0, left: 0, width: '100%', height: 'auto', overflow: 'hidden'});
}
}

$('.zoom-right').css({
zoom: zoom,
marginLeft: _this.isChrome?-$('.zoom-right').width():(-$('.zoom-right').width()) * (zoom),
marginTop: _this.isChrome?-$('.zoom-right').height() / 2:(-$('.zoom-right').height() / 2) * (zoom)

});
$('.zoom-top').css({
zoom: zoom,
marginLeft: _this.isChrome?-$('.zoom-top').width()/2:(-$('.zoom-top').width()/2) * (zoom)
});
$('.zoom-bottom').css({
zoom: zoom,
marginTop: _this.isChrome?-$('.zoom-bottom').height():(-$('.zoom-bottom').height()) * (zoom),
marginLeft: _this.isChrome?-$('.zoom-bottom').width()/2:(-$('.zoom-bottom').width()/2) * (zoom)
});
$('.zoom-left').css({
zoom: zoom,
marginTop: _this.isChrome?-$('.zoom-left').height()/2:(-$('.zoom-left').height()/2) * (zoom)
});
} else {
current.css({
position: 'absolute',
top: '50%',
left: '50%',
marginLeft: (-currentW / 2),
marginTop: (-currentH / 2),
webkitTransform: 'scale(' + zoom + ')',
mozWebkitTransform: 'scale(' + zoom + ')',
msWebkitTransform: 'scale(' + zoom + ')',
oWebkitTransform: 'scale(' + zoom + ')',
transform: 'scale(' + zoom + ')'
});
if (!_this.center) {
current.css({
position: 'relative',
top: 0,
marginTop: 0,
webkitTransformOrigin: 'center 0',
mozTransformOrigin: 'center 0',
msTransformOrigin: 'center 0',
oTransformOrigin: 'center 0',
transformOrigin: 'center 0'
});
parent.css({
height: current[0].scrollHeight*zoom
});
}
$('.zoom-right').css({
webkitTransform: 'scale(' + zoom + ')',
mozWebkitTransform: 'scale(' + zoom + ')',
msWebkitTransform: 'scale(' + zoom + ')',
oWebkitTransform: 'scale(' + zoom + ')',
transform: 'scale(' + zoom + ')',
webkitTransformOrigin: 'right center',
mozTransformOrigin: 'right center',
msTransformOrigin: 'right center',
oTransformOrigin: 'right center',
transformOrigin: 'right center'

});
$('.zoom-top').css({
webkitTransform: 'scale(' + zoom + ')',
mozWebkitTransform: 'scale(' + zoom + ')',
msWebkitTransform: 'scale(' + zoom + ')',
oWebkitTransform: 'scale(' + zoom + ')',
transform: 'scale(' + zoom + ')',
webkitTransformOrigin: 'center top',
mozTransformOrigin: 'center top',
msTransformOrigin: 'center top',
oTransformOrigin: 'center top',
transformOrigin: 'center top'
});
$('.zoom-bottom').css({
webkitTransform: 'scale(' + zoom + ')',
mozWebkitTransform: 'scale(' + zoom + ')',
msWebkitTransform: 'scale(' + zoom + ')',
oWebkitTransform: 'scale(' + zoom + ')',
transform: 'scale(' + zoom + ')',
webkitTransformOrigin: 'center bottom',
mozTransformOrigin: 'center bottom',
msTransformOrigin: 'center bottom',
oTransformOrigin: 'center bottom',
transformOrigin: 'center bottom'
});
$('.zoom-left').css({
webkitTransform: 'scale(' + zoom + ')',
mozWebkitTransform: 'scale(' + zoom + ')',
msWebkitTransform: 'scale(' + zoom + ')',
oWebkitTransform: 'scale(' + zoom + ')',
transform: 'scale(' + zoom + ')',
webkitTransformOrigin: 'left center',
mozTransformOrigin: 'left center',
msTransformOrigin: 'left center',
oTransformOrigin: 'left center',
transformOrigin: 'left center'
});
}
}
};
$(window).resize(this.zoomCtr);
$(window).load(this.zoomCtr);
this.zoomCtr();
}
//背景自适应
function bg_size(){
var bg_h = 920;
var bg_w = 1920;
var win_h = $('.wrapper').height();
var win_w = $('.wrapper').width();
if(bg_h/bg_w >= win_h/win_w){
$('.s-bg').attr('style',"width:100%;position:absolute;left:50%;top:50%;margin-top:-"+bg_h*(win_w/bg_w)/2+"px;margin-left:-"+win_w/2+"px");
}else{
$('.s-bg').attr('style',"height:100%;position:absolute;top:50%;left:50%;margin-left:-"+bg_w*(win_h/bg_h)/2+"px;margin-top:-"+win_h/2+"px");
}
}