Web前端_配合swiper滑动插件实现同比例双指缩放图片

参考过的一篇文章：https://blog.csdn.net/gl0ry/article/details/56055414

html实例代码:

缩放的图片需要放在class 为list 的div里面

<!doctype html>
<html>
<head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><meta name="viewport" content="width=device-width,initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no" /><title>图片缩放</title><link rel="stylesheet" href="css/scale.css" type="text/css" />
</head>
<body><div class="list"><img src="img/2.jpg" /></div><section class="imgzoom_pack"><div class="imgzoom_x">X</div><div class="imgzoom_img"><img src="" /></div></section><script src="js/scale.js"></script><script>document.addEventListener("DOMContentLoaded", function(event){ImagesZoom.init({"elem": ".list"});}, false);</script>
</body>
</html>

实现缩放需要导入 scale.css 和 scale.js

scale.css代码:

/**rest**/
body, ul, li, section, div{padding:0;margin:0;
}
body{font-family:Arial,Roboto,'Droid Sans','Hiragino Sans GB',STXihei,'sans-serif';width:100%;-webkit-user-select:none;-webkit-touch-callout:none;-webkit-tap-highlight-color:rgba(0,0,0,0);-webkit-text-size-adjust:none;
}
ul,li{list-style:none;
}
img{border:0;
}.list{width:100%;padding:10px 0;
}
.list li{display:block;margin-bottom:10px;box-shadow:0 1px 2px rgba(0,0,0,.1), 0 -1px 2px rgba(0,0,0,.1);
}
.list li img{width:100%;height:auto;
}/*弹框样式*/
.imgzoom_pack{width:100%;height:100%;position:fixed;left:0;top:0;background:rgba(0,0,0,.7);display:none;
}
.imgzoom_pack .imgzoom_x{color:#fff;height:30px;width:30px;line-height:30px;background:#000;text-align:center;position:absolute;right:5px;top:5px;z-index:10;cursor:pointer;
}
.imgzoom_pack .imgzoom_img{width:100%;height:100%;position:absolute;left:0;top:0;overflow:hidden;
}
.imgzoom_pack .imgzoom_img img{width:100%;position:absolute;top:50%;
}

scale.js的代码:

我对scale.js 做了一点修改实现了同比例缩放:

self.element.style.height = imgHeight + "px" //实现同比例缩放 需要改变图片width的同时 改变height

self.element.style.height = self.imgBaseHeight + "px" //实现同比例缩放 需要改变图片width的同时 改变height

(function(window, undefined){var document = window.document,support = {transform3d: ("WebKitCSSMatrix" in window && "m11" in new WebKitCSSMatrix()),touch: ("ontouchstart" in window)};function getTranslate(x, y){var distX = x, distY = y;return support.transform3d ? "translate3d("+ distX +"px, "+ distY +"px, 0)" : "translate("+ distX +"px, "+ distY +"px)";}function getPage(event, page) {return support.touch ? event.changedTouches[0][page] : event[page];}var ImagesZoom = function(){};ImagesZoom.prototype = {// 给初始化数据init: function(param){var self   = this,params = param || {};var imgList   = document.querySelectorAll(params.elem + " img"),zoomMask  = document.querySelector(".imgzoom_pack"),zoomImg   = document.querySelector(".imgzoom_pack .imgzoom_img img"),zoomClose = document.querySelector(".imgzoom_pack .imgzoom_x"),imgSrc    = "";self.buffMove   = 3; //缓冲系数self.buffScale  = 1.1; //放大系数self.finger = false; //触摸手指的状态 false：单手指 true：多手指self._destroy();zoomClose.addEventListener("click", function(){zoomMask.style.cssText = "display:none";zoomImg.src = "";zoomImg.style.cssText = "";self._destroy();document.removeEventListener("touchmove", self.eventStop, false);}, false);for(var len=imgList.length,i=0; i<len; i++){imgList[i].addEventListener("click", function(){imgSrc = this.getAttribute("src");zoomMask.style.cssText = "display:block";zoomImg.src = imgSrc;zoomImg.onload = function(){zoomImg.style.cssText = "margin-top:-"+(zoomImg.offsetHeight/2)+"px";// 禁止页面滚动document.addEventListener("touchmove", self.eventStop, false);self.imgBaseWidth  = zoomImg.offsetWidth;self.imgBaseHeight = zoomImg.offsetHeight;self.addEventStart({wrapX: zoomMask.offsetWidth,wrapY: zoomMask.offsetHeight,mapX: zoomImg.width,mapY: zoomImg.height});}}, false);}},addEventStart: function(param){var self   = this,params = param || {};self.element = document.querySelector(".imgzoom_pack img");//config setself.wrapX = params.wrapX || 0;     //可视区域宽度self.wrapY = params.wrapY || 0;     //可视区域高度self.mapX  = params.mapX || 0;      //地图宽度self.mapY  = params.mapY || 0;      //地图高度self.outDistY = (self.mapY - self.wrapY)/2; //图片超过一屏的时候有用self.width  = self.mapX - self.wrapX;   //地图的宽度减去可视区域的宽度self.height = self.mapY - self.wrapY;   //地图的高度减去可视区域的高度self.element.addEventListener("touchstart",function(e){self._touchstart(e);},false);self.element.addEventListener("touchmove",function(e){self._touchmove(e);},false);self.element.addEventListener("touchend",function(e){self._touchend(e);},false);},// 重置坐标数据_destroy: function(){this.distX = 0;this.distY = 0;this.newX  = 0;this.newY  = 0;},// 更新地图信息_changeData: function(){this.mapX     = this.element.offsetWidth;     //地图宽度this.mapY     = this.element.offsetHeight;      //地图高度// this.outDistY = (this.mapY - this.wrapY)/2; //当图片高度超过屏幕的高度时候。图片是垂直居中的，这时移动有个高度做为缓冲带this.width    = this.mapX - this.wrapX;   //地图的宽度减去可视区域的宽度this.height   = this.mapY - this.wrapY;   //地图的高度减去可视区域的高度},_touchstart: function(e){var self = this;e.preventDefault();var touchTarget = e.targetTouches.length; //获得触控点数self._changeData(); //重新初始化图片、可视区域数据，由于放大会产生新的计算if(touchTarget == 1){// 获取开始坐标self.basePageX = getPage(e, "pageX");self.basePageY = getPage(e, "pageY");self.finger = false;}else{self.finger = true;self.startFingerDist = self.getTouchDist(e).dist;self.startFingerX    = self.getTouchDist(e).x;self.startFingerY    = self.getTouchDist(e).y;}console.log("pageX: "+getPage(e, "pageX"));console.log("pageY: "+getPage(e, "pageY"));},_touchmove: function(e){var self = this;e.preventDefault();e.stopPropagation();console.log("event.changedTouches[0].pageY: "+event.changedTouches[0].pageY);var touchTarget = e.targetTouches.length; //获得触控点数if(touchTarget == 1 && !self.finger){self._move(e);}if(touchTarget>=2){self._zoom(e);}},_touchend: function(e){var self = this;self._changeData(); //重新计算数据if(self.finger){self.distX = -self.imgNewX;self.distY = -self.imgNewY;}if( self.distX>0 ){self.newX = 0;}else if( self.distX<=0 && self.distX>=-self.width ){self.newX = self.distX;self.newY = self.distY;}else if( self.distX<-self.width ){self.newX = -self.width;}self.reset();},_move: function(e){var self = this,pageX = getPage(e, "pageX"), //获取移动坐标pageY = getPage(e, "pageY");// 禁止默认事件// e.preventDefault();// e.stopPropagation();// 获得移动距离self.distX = (pageX - self.basePageX) + self.newX;self.distY = (pageY - self.basePageY) + self.newY;if(self.distX > 0){self.moveX = Math.round(self.distX/self.buffMove);}else if( self.distX<=0 && self.distX>=-self.width ){self.moveX = self.distX;}else if(self.distX < -self.width ){self.moveX = -self.width+Math.round((self.distX+self.width)/self.buffMove);}self.movePos();self.finger = false;},// 图片缩放_zoom: function(e){var self = this;// e.preventDefault();// e.stopPropagation();var nowFingerDist = self.getTouchDist(e).dist, //获得当前长度ratio         = nowFingerDist / self.startFingerDist, //计算缩放比imgWidth      = Math.round(self.mapX * ratio), //计算图片宽度imgHeight     = Math.round(self.mapY * ratio); //计算图片高度// 计算图片新的坐标self.imgNewX = Math.round(self.startFingerX * ratio - self.startFingerX - self.newX * ratio);self.imgNewY = Math.round((self.startFingerY * ratio - self.startFingerY)/2 - self.newY * ratio);if(imgWidth >= self.imgBaseWidth){self.element.style.width = imgWidth + "px";self.element.style.height = imgHeight + "px" //实现同比例缩放 需要改变图片width的同时 改变heightself.refresh(-self.imgNewX, -self.imgNewY, "0s", "ease");self.finger = true; }else{if(imgWidth < self.imgBaseWidth){ //缩放时 当前图片的宽度width 小于 原本的图片宽度时self.element.style.width = self.imgBaseWidth + "px";self.element.style.height = self.imgBaseHeight + "px" //实现同比例缩放 需要改变图片width的同时 改变height}}self.finger = true;},// 移动坐标movePos: function(){var self = this;if(self.height<0){if(self.element.offsetWidth == self.imgBaseWidth){self.moveY = Math.round(self.distY/self.buffMove);}else{var moveTop = Math.round((self.element.offsetHeight-self.imgBaseHeight)/2);self.moveY = -moveTop + Math.round((self.distY + moveTop)/self.buffMove);}}else{var a = Math.round((self.wrapY - self.imgBaseHeight)/2),b = self.element.offsetHeight - self.wrapY + Math.round(self.wrapY - self.imgBaseHeight)/2;if(self.distY >= -a){self.moveY = Math.round((self.distY + a)/self.buffMove) - a;}else if(self.distY <= -b){self.moveY = Math.round((self.distY + b)/self.buffMove) - b;}else{self.moveY = self.distY;}}self.refresh(self.moveX, self.moveY, "0s", "ease");},// 重置数据reset: function(){var self = this,hideTime = ".2s";if(self.height<0){self.newY = -Math.round(self.element.offsetHeight - self.imgBaseHeight)/2;}else{var a = Math.round((self.wrapY - self.imgBaseHeight)/2),b = self.element.offsetHeight - self.wrapY + Math.round(self.wrapY - self.imgBaseHeight)/2;if(self.distY >= -a){self.newY = -a;}else if(self.distY <= -b){self.newY = -b;}else{self.newY = self.distY;}}self.refresh(self.newX, self.newY, hideTime, "ease-in-out");},// 执行图片移动refresh: function(x, y, timer, type){this.element.style.webkitTransitionProperty = "-webkit-transform";this.element.style.webkitTransitionDuration = timer;this.element.style.webkitTransitionTimingFunction = type;this.element.style.webkitTransform = getTranslate(x, y);},// 获取多点触控getTouchDist: function(e){var x1 = 0,y1 = 0,x2 = 0,y2 = 0,x3 = 0,y3 = 0,result = {};x1 = e.touches[0].pageX;x2 = e.touches[1].pageX;y1 = e.touches[0].pageY - document.body.scrollTop;y2 = e.touches[1].pageY - document.body.scrollTop;if(!x1 || !x2) return;if(x1<=x2){x3 = (x2-x1)/2+x1;}else{x3 = (x1-x2)/2+x2;}if(y1<=y2){y3 = (y2-y1)/2+y1;}else{y3 = (y1-y2)/2+y2;}result = {dist: Math.round(Math.sqrt(Math.pow(x1-x2,2)+Math.pow(y1-y2,2))),x: Math.round(x3),y: Math.round(y3)};return result;},eventStop: function(e){e.preventDefault();e.stopPropagation();}};window.ImagesZoom = new ImagesZoom();
})(this);

以上代码可以实现点击一张图片出现一个全屏的效果点击全屏中的图片可以进行双指缩放

配合 Swiper 滑动插件时出现了点击打开全频全屏在swiper遮挡在Swiper下面的问题

解决办法:

将最外两层的 z-index 设置为0

  <!-- Swiper --><div class="swiper-container" style="z-index: 0;"> <!-- 这里需要将 z-index 设置为0 不然会覆盖在下面 --><div class="swiper-wrapper" style="z-index: 0;"> <!-- 这里需要将 z-index 设置为0 不然会覆盖在下面 --><div class="swiper-slide"><div class="list"><img src="img/bg1.jpg" /></div></div><div class="swiper-slide"><div class="list"><img src="img/bg1.jpg" /></div></div><div class="swiper-slide"><div class="list"><img src="img/bg1.jpg" /></div></div><div class="swiper-slide"><div class="list"><img src="img/bg1.jpg" /></div></div></div><!-- Add Pagination --><div class="swiper-pagination"><span class="my-bullet2" tabindex="0" role="button" aria-label="Go to slide 2">2222</span> </div></div>

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