Angular手机端图片放大缩小

首先在controller中写一个指令，Angular中使用.directive声明一个指令

var demoForDirective = angular.module('demoForDirective', ['demoForDirective.controller']);//图片缩放指令demoForDirective.directive('pinchZoom', function () {return {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 scalingvar 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 elementvar 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 ? evt.originalEvent.touches : evt.touches;startX = touches[0].clientX;startY = touches[0].clientY;initialPositionX = positionX;initialPositionY = positionY;moveX = 0;moveY = 0;}/*** @param {object} evt*/function touchmoveHandler(evt) {var touches = evt.originalEvent ? evt.originalEvent.touches : evt.touches;if (mode === '') {if (touches.length === 1 && scale > 1) {mode = 'swipe';} else if (touches.length === 2) {mode = 'pinch';initialScale = scale;initialDistance = getDistance(touches);originX = touches[0].clientX -parseInt((touches[0].clientX - touches[1].clientX) / 2, 10) -element[0].offsetLeft - initialPositionX;originY = touches[0].clientY -parseInt((touches[0].clientY - touches[1].clientY) / 2, 10) -element[0].offsetTop - initialPositionY;}}if (mode === 'swipe') {evt.preventDefault();moveX = touches[0].clientX - startX;moveY = touches[0].clientY - startY;positionX = initialPositionX + moveX;positionY = initialPositionY + moveY;transformElement();} else if (mode === 'pinch') {evt.preventDefault();distance = getDistance(touches);relativeScale = distance / initialDistance;scale = relativeScale * initialScale;positionX = originX * (1 - relativeScale) + initialPositionX + moveX;positionY = originY * (1 - relativeScale) + initialPositionY + moveY;transformElement();}}/*** @param {object} evt*/function touchendHandler(evt) {var touches = evt.originalEvent ? evt.originalEvent.touches : evt.touches;if (mode === '' || touches.length > 0) {return;}if (scale < 1) {scale = 1;positionX = 0;positionY = 0;} else if (scale > maxScale) {scale = maxScale;relativeScale = scale / initialScale;positionX = originX * (1 - relativeScale) + initialPositionX + moveX;positionY = originY * (1 - relativeScale) + initialPositionY + moveY;} else {if (positionX > 0) {positionX = 0;} else if (positionX < elWidth * (1 - scale)) {positionX = elWidth * (1 - scale);}if (positionY > 0) {positionY = 0;} else if (positionY < elHeight * (1 - scale)) {positionY = elHeight * (1 - scale);}}transformElement(0.1);mode = '';}/*** @param {Array} touches* @return {number}*/function getDistance(touches) {var d = Math.sqrt(Math.pow(touches[0].clientX - touches[1].clientX, 2) +Math.pow(touches[0].clientY - touches[1].clientY, 2));return parseInt(d, 10);}/*** @param {number} [duration]*/function transformElement(duration) {var transition = duration ? 'all cubic-bezier(0,0,.5,1) ' + duration + 's' : '';var matrixArray = [scale, 0, 0, scale, positionX, positionY];var matrix = 'matrix(' + matrixArray.join(',') + ')';element.css({'-webkit-transition': transition,transition: transition,'-webkit-transform': matrix + ' translate3d(0,0,0)',transform: matrix});}}})

在HTML界面上相关位置 使用指令

//在元素后面添加上指令即可<img class="solutionDetailImg  modalImgCss" id="singleImg" ng-click="hideImg()" ng-src="{{slidePage}}" pinch-zoom/>