AngularJS 仿微信图片手势缩放的实例

'use strict';

/**
 * @ngInject
 */
module.exports = function () {
  var _directive = {
    restrict : 'A',
    scope  : false,
    link   : _link
  };

  function _link(scope, element, attrs) {
    var elWidth, elHeight;

    // mode : 'pinch' or 'swipe'
    var mode = '';

    // distance between two touche points (mode : 'pinch')
    var distance = 0;
    var initialDistance = 0;

    // image scaling
    var scale = 1;
    var relativeScale = 1;
    var initialScale = 1;
    var maxScale = parseInt(attrs.maxScale, 10);
    if (isNaN(maxScale) || maxScale <= 1) {
      maxScale = 3;
    }

    // position of the upper left corner of the element
    var positionX = 0;
    var positionY = 0;

    var initialPositionX = 0;
    var initialPositionY = 0;

    // central origin (mode : 'pinch')
    var originX = 0;
    var originY = 0;

    // start coordinate and amount of movement (mode : 'swipe')
    var startX = 0;
    var startY = 0;
    var moveX = 0;
    var moveY = 0;

    var image = new Image();
    image.onload = function() {
      elWidth = element[0].clientWidth;
      elHeight = element[0].clientHeight;

      element.css({
        '-webkit-transform-origin' : '0 0',
        'transform-origin'     : '0 0'
      });

      element.on('touchstart', touchstartHandler);
      element.on('touchmove', touchmoveHandler);
      element.on('touchend', touchendHandler);
    };

    if (attrs.ngSrc) {
      image.src = attrs.ngSrc;
    } else {
      image.src = attrs.src;
    }

    /**
     * @param {object} evt
     */
    function touchstartHandler(evt) {
      var touches = evt.originalEvent "htmlcode">

 <img style="width:100%;" src="/UploadFiles/2021-04-02/floorplan.jpeg">

我们只需要在img文件上设定一个属性即可，是不是很简单呢？
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