diff --git a/src/uitls/preview.ts b/src/uitls/preview.ts
index b0706c46b7cf953294f1d3e4515a822ab7eb99e1..4bb651e2b1abdbe9972d55fb294a7be7529a63a4 100644
--- a/src/uitls/preview.ts
+++ b/src/uitls/preview.ts
@@ -35,4 +35,51 @@ function intercpt(calssname: HTMLElement) {
     return canvas.toDataURL('image/png', 1.0)
 
 }
+/** 
+ * 截取本地视频某一帧
+ * @ramerate
+*/
+function ramerate(url: string, width: string, height: string) {
+    return new Promise(function (resolve, reject) {
+        const video = document.createElement('video')
+        video.currentTime = 8 // 指定帧数
+        video.setAttribute('mut', 'true')
+        video.setAttribute('crossOrigin', 'anonymous') // 处理跨域
+        video.setAttribute('crossOrigin', 'anonymous') // 处理跨域
+        video.setAttribute('src', url)
+        video.setAttribute('x5-video-player-type', 'h5-page')
+        video.setAttribute('preload', 'metadata')
+        video.setAttribute('width', width)
+        video.setAttribute('height', height)
+        video.addEventListener('loadeddata', () => {
+            const canvas = document.createElement('canvas') as any
+            const width = video.width // canvas的尺寸和图片一样
+            const height = video.height
+            canvas.width = width
+            canvas.height = height
+            canvas.getContext('2d').drawImage(video, 0, 0, width, height) // 绘制canvas
+            var dataURL = canvas.toDataURL('image/jpeg') // 转换为base64 
+            console.log(dataURL);
+            resolve(dataURL);
+        })
+    })
+}
+/** 
+ * 截取本地图片第一帧转化为文件类型
+ * @convert
+*/
+function convert(url: any, name: string) {
+    // console.log(url);
+    var arr = url.split(","),
+        mime = arr[0].match(/:(.*?);/)[1],
+        bstr = atob(arr[1]),
+        n = bstr.length,
+        u8arr = new Uint8Array(n);
+    while (n--) {
+        u8arr[n] = bstr.charCodeAt(n);
+    }
+    console.log(new File([u8arr], name || 'png', { type: mime }));
+    return new File([u8arr], name || 'png', { type: mime })
+}
+
 export {preview ,intercpt}
\ No newline at end of file