> For the complete documentation index, see [llms.txt](https://docs.iproyal.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.iproyal.com/cn/gong-ju/wang-luo-jie-suo-qi/javascript-xuan-ran.md).

# JavaScript渲染

默认情况下，Web解锁器会尝试使用简单的HTTP请求加载网站。它会检查HTTP响应状态码，若响应成功（如状态码为200），则将响应正文返回给客户端。

然而，有些网站会在返回200 OK的状态码的同时，也会返回占位符或错误信息，提示**JavaScript已被禁用**。在这种情况下，实际页面内容未被渲染或显示。

为解决这一问题，Web解锁器提供了**按需启用的JavaScript渲染功能**（通过特殊的渲染标志来实现）。该功能会指示解锁器在无头浏览器中完整渲染页面后再返回响应，从而支持访问依赖JavaScript的内容。

**如何使用**`渲染标`**志**

您在代理凭证的密码后附加`_render-1`即可启用渲染功能。示例如下：

```
curl -x http://username:password_render-1@unblocker.iproyal.com:12323 https://example.com  -k -v
```

**应用场景**

* 访问需要JavaScript才能显示内容的网站
* 绕过依赖JavaScript的反爬虫验证页面
* 爬取具有动态前端的现代Web应用程序

**注意事项**

* 由于启动无头浏览器会产生额外开销，渲染可能会导致响应时间变长。
* 仅在需要时使用渲染功能，因为大多数网站仍然可通过基本的HTTP请求访问。


---

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