<div id="tips">
    <a id="manual" href="javascript:;" rel="external nofollow"  rel="external nofollow" >手動放煙花</a>
    <a id="auto" href="javascript:;" rel="external nofollow"  rel="external nofollow" >自動放煙花</a>
  </div>

    html,
    body {
      overflow: hidden;
    }

    body,
    div,
    p {
      margin: 0;
      padding: 0;
    }

    body {
      background: #000;
      font: 12px/1.5 arial;
      color: #7A7A7A;
    }

    a {
      text-decoration: none;
      outline: none;
    }

    #tips,
    #copyright {
      position: absolute;
      width: 100%;
      height: 50px;
      text-align: center;
      background: #171717;
      border: 2px solid #484848;
    }

    #tips {
      top: 0;
      border-width: 0 0 2px;
    }

    #tips a {
      font: 14px/30px arial;
      color: #FFF;
      background: #F06;
      display: inline-block;
      margin: 10px 5px 0;
      padding: 0 15px;
      border-radius: 15px;
    }

    #tips a.active {
      background: #FE0000;
    }

    #copyright {
      bottom: 0;
      line-height: 50px;
      border-width: 2px 0 0;
    }

    #copyright a {
      color: #FFF;
      background: #7A7A7A;
      padding: 2px 5px;
      border-radius: 10px;
    }

    #copyright a:hover {
      background: #F90;
    }

    p {
      position: absolute;
      top: 55px;
      width: 100%;
      text-align: center;
    }

  var fgm = {
    on: function (element, type, handler) {
      return element.addEventListener ? element.addEventListener(type, handler, false) : element.attachEvent("on" + type, handler)
    },
    un: function (element, type, handler) {
      return element.removeEventListener ? element.removeEventListener(type, handler, false) : element.detachEvent("on" + type, handler)
    },
    bind: function (object, handler) {
      return function () {
        return handler.apply(object, arguments)
      }
    },
    randomRange: function (lower, upper) { //產生范圍在lower~upper的隨機數
      return Math.floor(Math.random() * (upper - lower + 1) + lower)
    },
    getRanColor: function () { //隨機獲得十六進制顏色
      var str = this.randomRange(0, 0xFFFFFF).toString(16);
      while (str.length < 6) str = "0" + str;
      return "#" + str
    }
  };
  //初始化對象
  function FireWorks() {
    this.type = 0;
    this.timer = null;
    this.fnManual = fgm.bind(this, this.manual)
  }
  FireWorks.prototype = {
    initialize: function () {
      clearTimeout(this.timer);
      fgm.un(document, "click", this.fnManual);
      switch (this.type) {
        case 1:
          fgm.on(document, "click", this.fnManual);
          break;
        case 2:
          this.auto();
          break;
      };
    },
    manual: function (event) {
      event = event || window.event;
      this.__create__({
        x: event.clientX,
        y: event.clientY
      });
    },

    auto: function () {
      var that = this;
      that.timer = setTimeout(function () {
        that.__create__({
          x: fgm.randomRange(50, document.documentElement.clientWidth - 50),
          y: fgm.randomRange(50, document.documentElement.clientHeight - 150)
        })
        that.auto();
      }, fgm.randomRange(900, 1100))
    },
    __create__: function (param) {
      //param即鼠標點擊點（即煙花爆炸點）
      var that = this;
      var oEntity = null;
      var oChip = null;
      var aChip = [];
      var timer = null;
      var oFrag = document.createDocumentFragment();

      oEntity = document.createElement("div");
      with (oEntity.style) { //煙花上升過程實體初始化
        position = "absolute";
        //初始位置距網頁頂部為：整個網頁的高度（處于網頁底部）
        top = document.documentElement.clientHeight + "px";
        left = param.x + "px";
        width = "4px";
        height = "30px";
        borderRadius = "4px";
        background = fgm.getRanColor();
      };
      document.body.appendChild(oEntity);
      //window.setInterval方法 該方法使得一個函數每隔固定時間被調用一次
      //                console.log(param.y);
      oEntity.timer = setInterval(function () {
        //                    console.log(oEntity.offsetTop);
        //                    console.log(oEntity.style.top);
        oEntity.style.top = oEntity.offsetTop - 20 + "px";
        //判斷煙花是否上升到或者第一次超過上次鼠標點擊位置
        if (oEntity.offsetTop <= param.y) {
          //煙花爆炸
          clearInterval(oEntity.timer);
          document.body.removeChild(oEntity);
          (function () {
            //在50-100之間隨機生成碎片
            //由于IE瀏覽器處理效率低, 隨機范圍縮小至20-30
            //自動放煙花時, 隨機范圍縮小至20-30
            var len = (/msie/i.test(navigator.userAgent) || that.type == 2) ? fgm.randomRange(20, 30) : fgm.randomRange(50, 100)
            //產生所有煙花爆炸顆粒實體
            for (i = 0; i < len; i++) {
              //煙花顆粒形態(tài)實體
              oChip = document.createElement("div");
              with (oChip.style) {
                position = "absolute";
                top = param.y + "px";
                left = param.x + "px";
                width = "4px";
                height = "4px";
                overflow = "hidden";
                borderRadius = "4px";
                background = fgm.getRanColor();
              };
              oChip.speedX = fgm.randomRange(-20, 20);
              oChip.speedY = fgm.randomRange(-20, 20);
              oFrag.appendChild(oChip);
              aChip[i] = oChip
            };
            document.body.appendChild(oFrag);
            timer = setInterval(function () {
              for (i = 0; i < aChip.length; i++) {
                var obj = aChip[i];
                with (obj.style) {
                  top = obj.offsetTop + obj.speedY + "px";
                  left = obj.offsetLeft + obj.speedX + "px";
                };
                obj.speedY++;
                //判斷煙花爆炸顆粒是否掉落至窗體之外，為真則remove
                //splice() 方法可刪除從 index 處開始的零個或多個元素
                (obj.offsetTop < 0 || obj.offsetLeft < 0 || obj.offsetTop > document.documentElement.clientHeight || obj.offsetLeft > document.documentElement.clientWidth) && (document.body.removeChild(obj), aChip.splice(i, 1))
              };
              //判斷煙花爆炸顆粒是否全部remove，為真則clearInterval(timer);
              !aChip[0] && clearInterval(timer);
            }, 30)
          })()
        }
      }, 30)
    }
  };

  fgm.on(window, "load", function () {
    var oTips = document.getElementById("tips");
    var aBtn = oTips.getElementsByTagName("a");
    var oFireWorks = new FireWorks();

    fgm.on(oTips, "click", function (event) {
      var oEvent = event || window.event;
      var oTarget = oEvent.target || oEvent.srcElement;
      var i = 0;
      if (oTarget.tagName.toUpperCase() == "A") {
        for (i = 0; i < aBtn.length; i++) aBtn[i].className = "";
        switch (oTarget.id) {
          case "manual":
            oFireWorks.type = 1;
            break;
          case "auto":
            oFireWorks.type = 2;
            break;
          case "stop":
            oFireWorks.type = 0;
            break;
        }
        oFireWorks.initialize();
        oTarget.className = "active";
        //阻止瀏覽器默認的事件冒泡行為
        oEvent.stopPropagation ? oEvent.stopPropagation() : oEvent.cancelBubble = true
      }
    });
  });
  fgm.on(document, "contextmenu", function (event) {
    var oEvent = event || window.event;
    oEvent.preventDefault ? oEvent.preventDefault() : oEvent.returnValue = false
  });