网页下雪代码

2014-01-10 23:05:48 -0500

HTML代码

<html>
<head>
<script type="text/javascript">
(function() {
    function j(a, b, c) {
      if (a.addEventListener) a.addEventListener(b, c, false);
      else a.attachEvent && a.attachEvent("on" + b, c)
    }
    function f(a) {
      if (typeof window.onload != "function") window.onload = a;
      else {
      var b = window.onload;
      window.onload = function() {
      b();
      a()
      }
      }
    }
    function g() {
      var a = {};
      for (type in {
      Top: "",
      Left: ""
      }) {
      var b = type == "Top" ? "Y": "X";
      if (typeof window["page" + b + "Offset"] != "undefined") a[type.toLowerCase()] = window["page" + b + "Offset"];
      else {
      b = document.documentElement.clientHeight ? document.documentElement: document.body;
      a[type.toLowerCase()] = b["scroll" + type]
      }
      }
      return a
    }
    function k() {
      var a = document.body,
      b;
      if (window.innerHeight) b = window.innerHeight;
      else if (a.parentElement.clientHeight) b = a.parentElement.clientHeight;
      else if (a && a.clientHeight) b = a.clientHeight;
      return b
    }
    function h(a) {
      this.parent = document.body;
      this.createEl(this.parent, a);
      this.size = Math.random() * 5 + 5;
      this.el.style.width = Math.round(this.size) + "px";
      this.el.style.height = Math.round(this.size) + "px";
      this.maxLeft = document.body.offsetWidth - this.size;
      this.maxTop = document.body.offsetHeight - this.size;
      this.left = Math.random() * this.maxLeft;
      this.top = g().top + 1;
      this.angle = 1.4 + 0.2 * Math.random();
      this.minAngle = 1.4;
      this.maxAngle = 1.6;
      this.angleDelta = 0.01 * Math.random();
      this.speed = 2 + Math.random()
    }
    var i = false;
    f(function() {
      i = true
    });
    window.createSnow = function(a, b) {
      if (i) {
      var c = [];
      setInterval(function() {
      b > c.length && Math.random() < b * 0.0025 && c.push(new h(a));
      for (var e = g().top, l = k(), d = c.length - 1; d >= 0; d--) if (c[d]) if (c[d].top < e || c[d].top > e + l) {
      c[d].remove();
      c.splice(d, 1)
      } else {
      c[d].move();
      c[d].draw()
      }
      },
      40);
      j(window, "scroll",
      function() {
      for (var e = c.length - 1; e >= 0; e--) c[e].draw()
      })
      } else f(function() {
      createSnow(a, b)
      })
    };
    h.prototype = {
      createEl: function(a, b) {
      this.el = document.createElement("img");
      this.el.setAttribute("src", b + "snow" + Math.floor(Math.random() * 4) + ".gif");
      this.el.style.position = "absolute";
      this.el.style.display = "block";
      this.el.style.zIndex = "99999";
      this.parent.appendChild(this.el)
      },
      move: function() {
      if (this.angle < this.minAngle || this.angle > this.maxAngle) this.angleDelta = -this.angleDelta;
      this.angle += this.angleDelta;
      this.left += this.speed * Math.cos(this.angle * Math.PI);
      this.top -= this.speed * Math.sin(this.angle * Math.PI);
      if (this.top < 0) this.top = this.maxTop;
      else if (this.top > this.maxTop) this.top = 0;
      if (this.left < 0) this.left = this.maxLeft;
      else if (this.left > this.maxLeft) this.left = 0
      },
      draw: function() {
      this.el.style.top = Math.round(this.top) + "px";
      this.el.style.left = Math.round(this.left) + "px"
      },
      remove: function() {
      this.parent.removeChild(this.el)
      }
    }
})();
</script>
</head>
<body bgcolor="#999999">
<script>
//使用方法
createSnow('http://axdxy.wodemo.com/entry/258492/b2121526c3818db3fc0b24857a5dfaad/snow0.gif  http://axdxy.wodemo.com/entry/258492/07015099fe5d99cafdc82c05e892922c/snow1.gif  http://axdxy.wodemo.com/entry/258492/6ec5d93af6de0b6c0e9984a195fdfeec/snow2.gif  http://axdxy.wodemo.com/entry/258492/07015099fe5d99cafdc82c05e892922c/snow3.gif', 60);//修改为自己的雪花图片存放目录，文件形式为snow1.gif  snow2.gif ......
</script>
</body>
</html>

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----Comments(1)----
翱翔的雄鹰 (@axdxy) | @ at 2014-01-10 23:15:
还可以

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