好的,所以我创建了自己的parallaxing jQuery / JS脚本,但我不知道如何定位支持以下内容的浏览器(需要以下内容):
网站(预览)我正在尝试这个: My Test Site
如何检测浏览器是否支持此功能? 我可以根据窗口宽度运行媒体查询吗? 我需要浏览器嗅探吗? 我无法在WWW上看到任何关于如何为此进行特征检测的线索。
非常感谢任何帮助。
我的JS代码在这里:(如果你愿意,请随意使用它)
var goTop = 0;
var thisGoTop = 0;
var thisHeight = 0;
var thisWinH = 0;
var bottomIntrusion = 0;
var thisMax = 0;
var bgPos = 0;
function parallax(){
goTop = $(window).scrollTop();
thisWinH = $(window).height();
$('div.para').each(function(){
thisGoTop = $(this).offset().top;
thisHeight = $(this).height();
thisMax = Math.floor(thisHeight * 0.3);
bottomIntrusion = (thisGoTop + (thisHeight / 2) - goTop) / thisWinH;
if (bottomIntrusion > 0) {
bgPos = 0 - (Math.floor(thisMax * bottomIntrusion));
$(this).css('background-position','center ' + bgPos + 'px');
}
});
}
parallax();
$(window).scroll(function(){
parallax();
});
修改 我已经查看了Modernizr库,我还没有发现任何能给我提供CSS3背景位置变换支持的线索。我现在变得越来越接近掠夺,我不想去那里。
答案 0 :(得分:2)
<script src="http://code.jquery.com/jquery-1.10.2.min.js"></script>
<script>
$( document ).ready( function() {
var Compatibility = function()
{
var context = this;
context.TestObject = function( id )
{
function CreateObject( id )
{
$('body').prepend('<div id="CompatibilityTestObject_' + id + '"></div>');
}
// Constructor
CreateObject( id );
return {
GetObject: function( id )
{
try
{
// Fetch with raw Javascript so if the javascript method does not exist it will throw an error
var fetchedDomElement = document.getElementById( "CompatibilityTestObject_" + id );
return fetchedDomElement;
}
catch( e )
{
// Failed to fetch DOM Element
return false;
}
},
DeleteObject: function( id )
{
try
{
$( "#CompatibilityTestObject_" + id ).remove();
return true;
}
catch( e )
{
// Failed to remove object
return false;
}
}
}
}
context.Factory = function()
{
return {
CreateTestObject: function( id )
{
var m_TestObject = new context.TestObject( id );
return m_TestObject.GetObject( id );
},
DeleteTestObject: function( id )
{
return context.DeleteObject( id );
}
}
}();
var CSS = function()
{
return {
BackgroundPosition: function()
{
var testObject = context.Factory.CreateTestObject( "BackgroundPosition" );
try
{
// My first try at testing for background positioning
testObject.style.backgroundPosition = "center";
return true;
}
catch( e )
{
// Implement the handling of this error
//alert( "Does not support backgroundPosition: " + e.message );
return false;
}
}
}
}();
return {
CheckCSS: CSS
}
}();
} );
</script>
获取上述脚本的副本...将其放在您的代码中,然后像这样调用它:
if( Compatibility.CheckCSS.BackgroundPostion() )
{
// Compatible browser
}
else
{
// Not compatible
}