如何给这段JS滚动代码添加向上和向下滚动按钮

发布网友 发布时间：2022-04-26 15:32

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热心网友 时间：2022-04-23 13:59

var Scroll = Class.create();
    Scroll.prototype = {
        initialize: function(element, height) {
            this.element = $(element);
            this.element.innerHTML += this.element.innerHTML;
            this.height = height;
            this.maxHeight = this.element.scrollHeight / 2;            
            this.counter = 0;
            this.direction = true;
            this.scroll();
            this.timer = "";
            this.element.onmouseover = this.stop.bind(this);
            this.element.onmouseout = function() {
                this.timer = setTimeout(this.scroll.bind(this), 1000);
            }.bind(this);
        },
        up: function(elmUp) {
            this.elmUp = $(elmUp);
            this.elmUp.onclick = function() {
                clearTimeout(this.timer);
                this.direction = true;
                this.timer = setTimeout(this.scroll.bind(this), 1000);
            }.bind(this);
        },
        down: function(elmDown) {
            this.elmDown = $(elmDown);
            this.elmDown.onclick = function() {
                clearTimeout(this.timer);
                this.direction = false;
                this.timer = setTimeout(this.scroll.bind(this), 1000);
            }.bind(this);
        },
        scroll: function() {
            if(this.direction){
                if (this.element.scrollTop < this.maxHeight) {                                                
                    this.element.scrollTop++;
                    this.counter++;
                } else {
                    this.element.scrollTop = 0;    
                    this.counter = 0;
                }
            }else{
                if (this.element.scrollTop > 0) {                                                
                    this.element.scrollTop--;
                    this.counter++;
                } else {
                    this.element.scrollTop = this.maxHeight;    
                    this.counter = 0;
                }
            }

            if (this.counter < this.height) {
                this.timer = setTimeout(this.scroll.bind(this), 20);
            } else {
                this.counter = 0;
                this.timer = setTimeout(this.scroll.bind(this), 3000);
            }
        },
        stop: function() {
            clearTimeout(this.timer);
        }
    }
    var myscroll = new Scroll("myscroll", 40);
    myscroll.up("toTop");
    myscroll.down("toBottom");

没仔细测，你试试看，替换对应部分，增加了个参数direction控制方向，true向上，false向下，两个方法up/down给你绑按钮。