基于Node的Axure文件在线预览的实现代码

let realHref = url + '/' + item;
let realItem = item.split('/');
result += '<li> <a style="font-family:arial;font-size:20px;" href=' + realHref + '>' + realItem[0] + '</a></li>';
}
result = result + '</ul>';
return result;
}

async function file (url, filePath) {
let resultMime = parseMime(url);
let content;
if (resultMime && resultMime.indexOf('image/') >= 0) {
content = fs.readFileSync(filePath, 'binary');
} else {
content = fs.readFileSync(filePath, 'utf8');
}
return content;
}

async function content(ctx, fullStaticPath) {
let url = decodeURI(ctx.url);
let reqPath = path.join(fullStaticPath, url);
let exist = fs.existsSync(reqPath);
let content = '';
if (!exist) {
content = 'Local file not exists';
} else {
let stat = fs.statSync(reqPath);
if (stat.isDirectory()) {
content = dir(ctx.url, reqPath);
} else {
content = await file(ctx.url, reqPath);
}
}
return content;
}

function parseMime(url) {
let extName = path.extname(url);
extName = extName ? extName.slice(1) : 'unknown';
return mimes[extName];
}
const app = new Koa();
const staticPath = '../onlinedoc';`请输入代码`
app.use(async(ctx) => {
let fullStaticPath = path.join(__dirname, staticPath);
let resultContent = await content(ctx, fullStaticPath);
let resultMime = parseMime(ctx.url);
if (resultMime) {
ctx.type = resultMime;
}
if(resultMime && resultMime.indexOf('image/') >= 0) {
ctx.res.writeHead(200);
ctx.res.write(resultContent, 'binary');
ctx.res.end();
} else {
ctx.body = resultContent;
}
});
app.listen(8080, () => {
console.log('Running');
});