js鼠标滑轮滚动事件绑定的简单实例(兼容主流浏览器)

2024-05-06 14:30:37

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代码如下:
/** Event handler for mouse wheel event.
         *鼠标滚动事件
         */
        var wheel = function(event) {
            var delta = 0;
            if (!event) /* For IE. */
                event = window.event;
            if (event.wheelDelta) { /* IE/Opera. */
                delta = event.wheelDelta / 120;
            } else if (event.detail) {
                /** Mozilla case. */
                /** In Mozilla, sign of delta is different than in IE.
                 * Also, delta is multiple of 3.
                 */
                delta = -event.detail / 3;
            }
            /** If delta is nonzero, handle it.
             * Basically, delta is now positive if wheel was scrolled up,
             * and negative, if wheel was scrolled down.
             */
            if (delta)
                handle(delta);
            /** Prevent default actions caused by mouse wheel.
             * That might be ugly, but we handle scrolls somehow
             * anyway, so don't bother here..
             */
            if (event.preventDefault)
                event.preventDefault();
            event.returnValue = false;

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