需要在同一页面上使用多个相同的jQuery效果

Need more than one of the same jQuery effect on same page

本文关键字：jQuery 效果 一页      更新时间：2023-09-26

所以我正在使用这个jquery后台滚动器，基本上我想在同一页面上获得两个以上的滚动条(以不同的速度(，但我不知道该怎么做。

http://www.devirtuoso.com/2009/07/how-to-build-an-animated-header-in-jquery/

var scrollSpeed = 70;       // Speed in milliseconds
var step = 1;               // How many pixels to move per step
var current = 0;            // The current pixel row
var imageHeight = 4300;     // Background image height
var headerHeight = 300;     // How tall the header is.
//The pixel row where to start a new loop
var restartPosition = -(imageHeight - headerHeight);
function scrollBg(){
    //Go to next pixel row.
    current -= step;
    //If at the end of the image, then go to the top.
    if (current == restartPosition){
        current = 0;
    }
    //Set the CSS of the header.
    $('#header').css("background-position","0 "+current+"px");

}
//Calls the scrolling function repeatedly
var init = setInterval("scrollBg()", scrollSpeed);

我可以在脚本中添加其他 css，但我希望其他div 的速度不同。

@andy，这是Tom Th的想法;即一个JS构造函数，你可以从中实例化多个实例：

function bgScroller(options) {
    var settings = {
        containerID: '', //id of the scroller's containing element
        scrollSpeed: 50, //Speed in milliseconds
        step: 1, //How many pixels to move per step
        imageHeight: 0, //Background image height
        headerHeight: 0, //How tall the header is.
        autoStart: true
    };
    if(options) {
        jQuery.extend(settings, options);
    }
    var current = 0, // The current pixel row
        restartPosition = -(settings.imageHeight - settings.headerHeight), //The pixel row where to start a new loop 
        interval = null,
        $container = jQuery('#' + settings.containerID),
        that = {};
    if(!$container.length || !settings.imageHeight || !settings.headerHeight) {
        return false; //nothing will work without these settings so let's not even try
    }
    function setBg() {
        $container.css("background-position", "0 " + current + "px");
    }
    function scrollBg(){
        current -= settings.step;//Go to next pixel row.
        //If at the end of the image, then go to the top.
        if (current <= restartPosition){
            current = 0;
        }
        setBg();
    }
    that.reset = function() {
        that.stop();
        current = 0;
        setBg();
    }
    that.start = function() {
        interval = setInterval(scrollBg, settings.scrollSpeed);
    };
    that.stop = function(){
        clearInterval(interval);
    };
    that.reset();
    if(settings.autoStart) {
        that.start();
    }
    return that;
}

参数作为对象文本"map"的属性传递，覆盖构造函数中的硬编码默认值。对于未包含的任何参数，将使用默认值。这里有几个例子：

var headerScroller = new bgScroller({
    containerID: "header",
    scrollSpeed: 70, //Speed in milliseconds
    imageHeight: 4300, //Background image height
    headerHeight: 300, //How tall the header is.
});
var otherScroller = new bgScroller({
    containerID: "myOtherDiv",
    scrollSpeed: 30, //Speed in milliseconds
    imageHeight: 2800, //Background image height
    headerHeight: 200, //How tall the header is.
});

我包括了三种公共方法; .reset()、.start()和.stop()，它们在实例化后提供了对滚动条的有限控制。按如下方式使用：

  • headerScroller.stop();
  • headerScroller.reset();
  • headerScroller.start();

笔记：

  • 在这里工作演示。
  • 依赖项：jQuery 1.0 或更高版本
  • .reset()呼叫会自动.stop()，因此无需事先致电.stop()。
  • 没有规定在实例化后更改设置，但这可以通过多考虑一下来实现。
  • jQuery插件将类似，但需要更多的时间来开发(几乎没有优势(。
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