使用mui实现长按保存图片

转自：https://blog.csdn.net/qq_36676237/article/details/81533124

首先初始化mui（longtap是我们要用到的，longtap默认为false，如果没有初始化为true，则长按事件无效）
mui.init( { gestureConfig:{
tap: true, //默认为true
doubletap: true, //默认为false
longtap: true, //默认为false
swipe: true, //默认为true
drag: true, //默认为true
hold:true,//默认为false，不监听
release:false//默认为false，不监听
}});
//给需要长按保存图片的img标签设置 class='saveImg'
var divs = document.getElementsByClassName('saveImg');
for(var i = 0;i<divs.length;i++){
divs[i].addEventListener('longtap', function () {
//开启弹框
mui('#picture').popover('toggle');
var imgurl = this.src;
document.getElementById('saveImg').addEventListener('tap', function () {
var imgDtask = plus.downloader.createDownload(imgurl,{method:'GET'}, function (d,status) {
if(status == 200){
plus.gallery.save(d.filename, function () {//保存到相册
plus.io.resolveLocalFileSystemURL(d.filename, function (enpty) {
// 关闭弹框
mui('#picture').popover('toggle');
mui.toast('保存成功')
});
})
}else{
mui.toast('保存失败')
}
});
imgDtask.start();
});
})
}
<-- 弹框的html-->
<div style="z-index: 99999999">
<ul class="mui-table-view">
<li class="mui-table-view-cell">
<a href="javascript:;" id="saveImg">保存图片</a>
</li>
</ul>
<ul class="mui-table-view">
<li class="mui-table-view-cell">
<a href="https://tool.4xseo.com/article/137373.html"><b>取消</b></a>
</li>
</ul>
</div>
ps：要引入mui的js和css

另一种方法：

<script type="text/javascript">mui.init({gestureConfig:{longtap:true}});


    mui.plusReady(function(){document.addEventListener('longtap',function(e){vartarget =e.target;savePic(target);});});
    /**
     * 长按保存图片
     * 1. 获取图片链接
     * 2. 创建下载并下载图片
     * 3. 保存至相册
     */functionsavePic(target){if(target.tagName =='IMG'&&target.currentSrc.length >0){//确保图片链接不为空varimgUrl =target.src;
            varsuffix =cutImageSuffix(imgUrl);
            mui.confirm("是否保存此图片","",["保存","取消"],function(event){varindex =event.index;if(index ==0){vartimestamp =(newDate()).valueOf();vardownLoader =plus.downloader.createDownload(imgUrl,{method:'GET',filename:'_downloads/image/'+timestamp+'.png'},function(download,status){varfileName =download.filename;/**
                         * 保存至本地相册
                         */plus.gallery.save(fileName,function(){mui.toast("保存成功");
                        });});/**
                     * 开始下载任务
                     */downLoader.start();}});