js实现悬浮窗效果

说明：

网页需要增加一个悬浮窗，慢慢飘动，点击图片新窗口跳转对应网页链接，点击关闭实现悬浮窗关闭。

https://www.yuque.com/meepo/blog/nmbqel

代码：

1.js文件（floatadv.js）

function addEvent(obj, evtType, func, cap) {
    cap = cap || false;
    if (obj.addEventListener) {
        obj.addEventListener(evtType, func, cap);
        return true;
    } else if (obj.attachEvent) {
        if (cap) {
            obj.setCapture();
            return true;
        } else {
            return obj.attachEvent("on" + evtType, func);
        }
    } else {
        return false;
    }
}
function removeEvent(obj, evtType, func, cap) {
    cap = cap || false;
    if (obj.removeEventListener) {
        obj.removeEventListener(evtType, func, cap);
        return true;
    } else if (obj.detachEvent) {
        if (cap) {
            obj.releaseCapture();
            return true;
        } else {
            return obj.detachEvent("on" + evtType, func);
        }
    } else {
        return false;
    }
}
function getPageScroll() {
    var xScroll, yScroll;
    if (self.pageXOffset) {
        xScroll = self.pageXOffset;
    } else if (document.documentElement && document.documentElement.scrollLeft) {
        xScroll = document.documentElement.scrollLeft;
    } else if (document.body) {
        xScroll = document.body.scrollLeft;
    }
    if (self.pageYOffset) {
        yScroll = self.pageYOffset;
    } else if (document.documentElement && document.documentElement.scrollTop) {
        yScroll = document.documentElement.scrollTop;
    } else if (document.body) {
        yScroll = document.body.scrollTop;
    }
    arrayPageScroll = new Array(xScroll, yScroll);
    return arrayPageScroll;
}
function GetPageSize() {
    var xScroll, yScroll;
    if (window.innerHeight && window.scrollMaxY) {
        xScroll = document.body.scrollWidth;
        yScroll = window.innerHeight + window.scrollMaxY;
    } else if (document.body.scrollHeight > document.body.offsetHeight) {
        xScroll = document.body.scrollWidth;
        yScroll = document.body.scrollHeight;
    } else {
        xScroll = document.body.offsetWidth;
        yScroll = document.body.offsetHeight;
    }
    var windowWidth, windowHeight;
    if (self.innerHeight) {
        windowWidth = self.innerWidth;
        windowHeight = self.innerHeight;
    } else if (document.documentElement && document.documentElement.clientHeight) {
        windowWidth = document.documentElement.clientWidth;
        windowHeight = document.documentElement.clientHeight;
    } else if (document.body) {
        windowWidth = document.body.clientWidth;
        windowHeight = document.body.clientHeight;
    }
    if (yScroll < windowHeight) {
        pageHeight = windowHeight;
    } else {
        pageHeight = yScroll;
    }
    if (xScroll < windowWidth) {
        pageWidth = windowWidth;
    } else {
        pageWidth = xScroll;
    }
    arrayPageSize = new Array(pageWidth, pageHeight, windowWidth, windowHeight)
    return arrayPageSize;
}
//广告脚本文件 AdMove.js
/*
例子
<div id="Div2">
***** content ******
</div>
var ad=new AdMove("Div2");
ad.Run();
*/
////////////////////////////////////////////////////////
var AdMoveConfig = new Object();
AdMoveConfig.IsInitialized = false;
AdMoveConfig.AdCount = 0;
AdMoveConfig.ScrollX = 0;
AdMoveConfig.ScrollY = 0;
AdMoveConfig.MoveWidth = 0;
AdMoveConfig.MoveHeight = 0;
AdMoveConfig.Resize = function () {
    var winsize = GetPageSize();
    AdMoveConfig.MoveWidth = winsize[2];
    AdMoveConfig.MoveHeight = winsize[3];
    AdMoveConfig.Scroll();
}
AdMoveConfig.Scroll = function () {
    var winscroll = getPageScroll();
    AdMoveConfig.ScrollX = winscroll[0];
    AdMoveConfig.ScrollY = winscroll[1];
}
addEvent(window, "resize", AdMoveConfig.Resize);
addEvent(window, "scroll", AdMoveConfig.Scroll);
function AdMove(id, addCloseButton) {
    if (!AdMoveConfig.IsInitialized) {
        AdMoveConfig.Resize();
        AdMoveConfig.IsInitialized = true;
    }
    AdMoveConfig.AdCount++;
    var obj = document.getElementById(id);
    obj.style.position = "absolute";
    var W = AdMoveConfig.MoveWidth - obj.offsetWidth;
    var H = AdMoveConfig.MoveHeight - obj.offsetHeight;
    var x = W * Math.random(), y = H * Math.random();
    var rad = (Math.random() + 1) * Math.PI / 6;
    var kx = Math.sin(rad), ky = Math.cos(rad);
    var dirx = (Math.random() < 0.5 ? 1 : -1), diry = (Math.random() < 0.5 ? 1 : -1);
    var step = 1;
    var interval;
    if (addCloseButton) {
        var closebtn = document.createElement("div");
        obj.appendChild(closebtn);

        closebtn.onclick = function () {
            obj.style.display = "none";
            clearInterval(interval);
            closebtn.onclick = null;
            obj.onmouseover = null;
            obj.onmouseout = null;
            obj.MoveHandler = null;
            AdMoveConfig.AdCount--;
            if (AdMoveConfig.AdCount <= 0) {
                removeEvent(window, "resize", AdMoveConfig.Resize);
                removeEvent(window, "scroll", AdMoveConfig.Scroll);
                AdMoveConfig.Resize = null;
                AdMoveConfig.Scroll = null;
                AdMoveConfig = null;
            }
        }
    }
    obj.MoveHandler = function () {
        obj.style.left = (x + AdMoveConfig.ScrollX) + "px";
        obj.style.top = (y + AdMoveConfig.ScrollY) + "px";
        rad = (Math.random() + 1) * Math.PI / 6;
        W = AdMoveConfig.MoveWidth - obj.offsetWidth;
        H = AdMoveConfig.MoveHeight - obj.offsetHeight;
        x = x + step * kx * dirx;
        if (x < 0) { dirx = 1; x = 0; kx = Math.sin(rad); ky = Math.cos(rad); }
        if (x > W) { dirx = -1; x = W; kx = Math.sin(rad); ky = Math.cos(rad); }
        y = y + step * ky * diry;
        if (y < 0) { diry = 1; y = 0; kx = Math.sin(rad); ky = Math.cos(rad); }
        if (y > H) { diry = -1; y = H; kx = Math.sin(rad); ky = Math.cos(rad); }
    }
    this.SetLocation = function (vx, vy) { x = vx; y = vy; }
    this.SetDirection = function (vx, vy) { dirx = vx; diry = vy; }
    this.Run = function () {
        var delay = 100;
        interval = setInterval(obj.MoveHandler, delay);
        obj.onmouseover = function () { clearInterval(interval); }
        obj.onmouseout = function () { interval = setInterval(obj.MoveHandler, delay); }
    }
}

2.页面改造

引用js
<script src="./js/jquery-1.8.0.min.js" language="javascript"></script>
<script src="./js/floatadv.js" language="javascript"></script>

添加悬浮框div
<div class="floatadv_ad" id="floatadv_ad" style="z-index:500">
  <div style="text-align:right;cursor:pointer; font-size: 0.16rem" id="closepiaofu">关闭</div>
    <a href="https://****" target="_blank">
      <img src="***/16590788382.png" width="400">
    </a>
  </div>
</div>

调用代码
if ($(".floatadv_ad>a").length) { //悬浮广告开启
  var ad = new AdMove('floatadv_ad')
  ad.Run()
  $('#closepiaofu').click(function(){
    $('#floatadv_ad').hide();
  })
}

除了没配效果图，超简单，有没有~

如果需要调整图片速度快慢，js文件171行。