show-menu-by-longpress 点击转发保存等无效       setTimeout(function () {         wx.canvasToTempFilePath({           canvasId: 'mycanvas',           success: function (res) {             let tempFilePath = res.tempFilePath;             that.setData({               loadImagePath: tempFilePath,             });           },           fail: function (res) {             console.log(res);           }         }, that);       }, 500); image 的src 使用的是loadImagePath

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