使用AlloyFinger（移动端点触插件）

插件gitHub地址https://github.com/AlloyTeam/AlloyFinger
直接贴代码。这里主要是用pressMove 和 pinch 功能。

var initScale = 1;
const mapEl = document.getElementById("map-element");
const imgEl = document.getElementById("hit");
const _timeout = 500;

Transform(mapEl);
Transform(imgEl);
new AlloyFinger(mapEl, {
    pinch: function(evt) {
        mapEl.scaleX = mapEl.scaleY = initScale * evt.zoom;
        imgEl.scaleX = imgEl.scaleY = initScale * evt.zoom;
    },
    pressMove: function(evt) {
        mapEl.translateX += evt.deltaX;
        mapEl.translateY += evt.deltaY;

        imgEl.translateX += evt.deltaX;
        imgEl.translateY += evt.deltaY;

        evt.preventDefault();
    },
    multipointEnd: function() {
        To.stopAll();
        if (mapEl.scaleX < 1) {

            new To(mapEl, "scaleX", 1, 500, ease);
            new To(mapEl, "scaleY", 1, 500, ease);

            new To(imgEl, "scaleX", 1, 500, ease);
            new To(imgEl, "scaleY", 1, 500, ease);
        }
        if (mapEl.scaleX > 4) {

            new To(mapEl, "scaleX", 4, 500, ease);
            new To(mapEl, "scaleY", 4, 500, ease);

            new To(imgEl, "scaleX", 4, 500, ease);
            new To(imgEl, "scaleY", 4, 500, ease);
        }

        let _minX = -(parseInt(mapEl.style.width) / 2)
        if (mapEl.translateX < _minX) {
            new To(mapEl, "translateX", _minX, _timeout, ease);
            new To(imgEl, "translateX", _minX, _timeout, ease);
        }

        let _maxX = (parseInt(mapEl.style.width) / 2)
        if (mapEl.translateX > _maxX) {
            new To(mapEl, "translateX", _maxX, _timeout, ease);
            new To(imgEl, "translateX", _maxX, _timeout, ease);
        }

         let _minY = -20;
        if (mapEl.translateY < _minY) {
            new To(mapEl, "translateY", _minY, _timeout, ease);
            new To(imgEl, "translateY", _minY, _timeout, ease);
        }

         let _maxY = 50;
        if (mapEl.translateY > _maxY) {
            new To(mapEl, "translateY", _maxY, _timeout, ease);
            new To(imgEl, "translateY", _maxY, _timeout, ease);
        }
        initScale = mapEl.scaleX;
    }
})

function ease(x) {
    return Math.sqrt(1 - Math.pow(x - 1, 2));
}

function moveTo(_storeId) {
    let _point = polygonPoints[_storeId];
    let _scale = 2;

    let _center = getCenter(_point);
    let _x = window.innerWidth - _center.deltaX * _scale;
    let _y = 30;

    highLight(_storeId);

    new To(mapEl, "scaleX", _scale, _timeout, ease);
    new To(mapEl, "scaleY", _scale, _timeout, ease);
    new To(imgEl, "scaleX", _scale, _timeout, ease);
    new To(imgEl, "scaleY", _scale, _timeout, ease);

    new To(mapEl, "translateX", _x, _timeout, ease);
    new To(mapEl, "translateY", _y, _timeout, ease);
    new To(imgEl, "translateX", _x, _timeout, ease);
    new To(imgEl, "translateY", _y, _timeout, ease);
}

function getCenter(_points) {
    let _oddY = 0;
    let _evenX = 0;
    let _result = {
        deltaX: 0,
        deltaY: 0
    };
    for (let i in _points) {
        if (i % 2 == 0) {
            _evenX += _points[i];
        } else {
            _oddY += _points[i];
        }
    }

    let _rate = $("#hit").width() / 1920;

    _result.deltaY = Math.round(_oddY * _rate / (_points.length / 2))
    _result.deltaX = Math.round(_evenX * _rate / (_points.length / 2))

    return _result;
}

主要是实现2个联动所以才会这么多重复的代码。
首先是获得元素，最好使用id，用class的话要加[0]（如果是第一个的话）;
Transform是动画插件。所有的插件可以来这里下载。https://pan.baidu.com/s/1qXEnk3y
提取密码 7x23。
这里有几点需要提醒大家：
1.有几个需要缩放的容器，就需要Transform多少个。
2.如果需要设置缩放不从1开始，可以在multipointEnd的时候。设置

initScale = mapEl.scaleX;

To是一个动画插件。可以限定拖动的区域。