.wxml
longpress:手指触摸后，超过350ms再离开，如果指定了事件回调函数并触发了这个事件，tap事件将不被触发
<view class="poster">
<image src="{
{poster}}" bindlongpress="saveImage" data-url="{
{poster}}"></image>
</view>
.js
// 长按保存功能--授权部分
saveImage(e) {
let _this = this
wx.showActionSheet({
//显示操作菜单
itemList: ['保存到相册'],
success(res) {
let url = e.currentTarget.dataset.url;
wx.getSetting({
success: (res) => {
if (!res.authSetting['scope.writePhotosAlbum']) {
//判断是否授权
wx.authorize({
//如果没授权，则向用户发起授权请求
scope: 'scope.writePhotosAlbum',
success: () => {
// 同意授权
_this.saveImgInner(url);
},
fail: (res) => {
console.log(res);
wx.showModal({
title: '保存失败',
content: '请开启访问手机相册权限',
success(res) {
wx.openSetting()
}
})
}
})
} else {
// 已经授权了
_this.saveImgInner(url);
}
},
fail: (res) => {
console.log(res);
}
})
},
fail(res) {
console.log(res.errMsg)
}
})
},
// 长按保存功能--保存部分
saveImgInner(url) {
wx.getImageInfo({
src: url,
success: (res) => {
let path = res.path;
wx.saveImageToPhotosAlbum({
filePath: path,
success: (res) => {
console.log(res);
wx.showToast({
title: '已保存到相册',
})
},
fail: (res) => {
console.log(res);
wx.showToast({
title: '保存失败',
})
}
})
},
fail: (res) => {
console.log(res);
wx.showToast({
title: '保存失败',
})
}
})
},
注：获取网络图片信息时，网络图片的域名一定要配置好