If the header marking the Ajax requests is not present, the user must have clicked the Submit button of the Web form.

如果标记此Ajax请求的头不存在，那么就表明用户一定是单击了Web表单的提交按钮。

youdao

If the header marking the Ajax requests is not present, the user must have clicked the Submit button of the Web form.

如果标记此Ajax请求的头不存在，那么就表明用户一定是单击了Web表单的提交按钮。

youdao