在移动设备上禁用视差

Question

我正在一个有着奇特的视差滚动背景的网站上工作,并按照Mohiuddin Parekh的教程(可在这里找到)

这是我的javascript:

$(document).ready(function(){
// Cache the Window object
$window = $(window);

 $('section[data-type="background"]').each(function(){
 var $bgobj = $(this); // assigning the object

  $(window).scroll(function() {

    // Scroll the background at var speed
    // the yPos is a negative value because we're scrolling it UP!                              
    var yPos = -( ($window.scrollTop() - $bgobj.offset().top) / $bgobj.data('speed'));

    // Put together our final background position
    var coords = '50% '+ yPos + 'px';

    // Move the background
    $bgobj.css({ backgroundPosition: coords });

 }); // window scroll Ends

 });    

});

这非常有效.现在我想做的是,如果使用移动设备查看网站(max-width:768px),则不执行javascript.不幸的是,我不太确定如何实现这一点,任何帮助表示赞赏:)

Answer 1

页面启动时文档就绪触发,有人操作窗口时窗口调整大小

$( window ).resize(function() {
$window = $(window);
if( $window .width() > 800){

 $('section[data-type="background"]').each(function(){
 var $bgobj = $(this); // assigning the object

  $(window).scroll(function() {

    // Scroll the background at var speed
    // the yPos is a negative value because we're scrolling it UP!                              
    var yPos = -( ($window.scrollTop() - $bgobj.offset().top) / $bgobj.data('speed'));

    // Put together our final background position
    var coords = '50% '+ yPos + 'px';

    // Move the background
    $bgobj.css({ backgroundPosition: coords });

 }); // window scroll Ends

 });    
}
});



$(document).ready(function(){
$window = $(window);
if( $window.width() > 800){
// Cache the Window object

 $('section[data-type="background"]').each(function(){
 var $bgobj = $(this); // assigning the object

  $(window).scroll(function() {

    // Scroll the background at var speed
    // the yPos is a negative value because we're scrolling it UP!                              
    var yPos = -( ($window.scrollTop() - $bgobj.offset().top) / $bgobj.data('speed'));

    // Put together our final background position
    var coords = '50% '+ yPos + 'px';

    // Move the background
    $bgobj.css({ backgroundPosition: coords });

 }); // window scroll Ends

 });    
}
});