Merge branch 'knowledge_dev' into debug

src/views/knowledge_manage/list.vue

@@ -432,7 +432,7 @@ export default {
 
       if(file){
         if(!reg.test(file.name)) return this.$message.warning('只能上传pdf/docx/ppt等文件');
-        if(file.size > 5.1*1024*1024) return this.$message.warning("上传文件大小不超过50MB");
+        if(file.size > 51*1024*1024) return this.$message.warning("上传文件大小不超过50MB");
 
         let downloadHint = this.$message({
             type:"info",