js自定义滑动函数如何在多个div适用，并且保存各自状态

Question

我现在有一个函数，用来使页面左右滑动。但是现在出现一个问题，滑动的场景有两个，一级菜单和二级菜单。现在如果用在一起的话，一级菜单滑动完以后数值会保存，当点入二级菜单以后使用之前的状态。如何可以将这个事件给拷贝或者各自不影响呢？

---

 $(el).on("touchstart", function(e) {
        var targetTouches = e.originalEvent.targetTouches;
        old_x = parseInt(targetTouches[0].pageX);
        _click = 1;
        var num = $(this).find("li").length;
        switch (true) {
            case num<=4:
            huadong = 1;
                break;
            case num > 4&&num <= 8:
            huadong = 2;
                break;
            default:
                huadong = 3;
                break;
        }
    }).on("touchend", function(e) {
        _click = 0;
        if(move == -1){
            if(jishu < huadong){
                jishu++;
                baifen-=parseFloat(100/huadong); 
                $(this).css({
                    "transform": "translateX("+baifen+"%)",
                    "transition": "all .5s"
                })
            }
        }else if (move == 1){
            if (jishu > 1) {
                jishu--;
                baifen += parseFloat(100/huadong);
            $(this).css({
                "transform": "translateX("+baifen+"%)",
                "transition": "all .5s"
            })
            }
        }
    }).on("touchmove", function(e) {
        var targetTouches = e.originalEvent.targetTouches;
        new_x = parseInt(targetTouches[0].pageX);
        if (_click == 1) {
            if (new_x - old_x < 50) { //向前
                move = -1;
            } else if (new_x - old_x > 50) {
                move = 1;
            } else {
                move = 0;
            }
        }
    })

Answer 1

相同的动作，不同的状态……采用 OOP 解决是非常合适的，直接上代码（没调试，仅示意）

class MyHandler {
    constructor(el) {
        this._el = el;
        this._el
            .on("touchstart", e => this.onTouchStart(e))
            .on("touchend", e => this.onTouchEnd(e))
            .on("touchmove", e => this.onTouchMove(e));

        this._click = 0;
        this._move = 0;
    }

    onTouchStart(e) {
        var targetTouches = e.originalEvent.targetTouches;
        this._oldX = parseInt(targetTouches[0].pageX);
        this._click = 1;
        var num = this._el.find("li").length;
        switch (true) {
            case num <= 4:
                huadong = 1;
                break;
            case num > 4 && num <= 8:
                huadong = 2;
                break;
            default:
                huadong = 3;
                break;
        }
    }

    onTouchEnd() {
        this._click = 0;
        if (this._move === -1) {
            if (jishu < huadong) {
                jishu++;
                baifen -= parseFloat(100 / huadong);
                this._el.css({
                    "transform": "translateX(" + baifen + "%)",
                    "transition": "all .5s"
                });
            }
        } else if (this._move === 1) {
            if (jishu > 1) {
                jishu--;
                baifen += parseFloat(100 / huadong);
                this._el.css({
                    "transform": "translateX(" + baifen + "%)",
                    "transition": "all .5s"
                });
            }
        }

    }

    onTouchMove() {
        var targetTouches = e.originalEvent.targetTouches;
        var newX = parseInt(targetTouches[0].pageX);
        if (this._click === 1) {
            if (newX - this._oldX < 50) { //向前
                this._move = -1;
            } else if (newX - this._oldX > 50) {
                this._move = 1;
            } else {
                this._move = 0;
            }
        }

    }
}