关于JavaScript是否会阻塞图片加载

来源：互联网发布：ubuntu安装tomcat8 编辑：程序博客网时间：2024/05/07 00:28

<?php //1.js.phpsleep(5);file_put_contents("tmp.txt", __FILE__.'->'.__LINE__.' ->' .date("Ymd H:i:s")."\r\n", FILE_APPEND);?>console.log("1.js");

<?php //2.js.phpsleep(3);file_put_contents("tmp.txt", __FILE__.'->'.__LINE__.' ->' .date("Ymd H:i:s")."\r\n", FILE_APPEND);?>console.log("2.js");

<?php //img.pgpfile_put_contents("tmp.txt", __FILE__.'->'.__LINE__.' ->' .date("Ymd H:i:s")."\r\n", FILE_APPEND);?>

用不同浏览器访问t.html:

<script  language="javascript" src="1.js.php"></script><script  language="javascript" src="2.js.php"></script><img src="img.php" />

日志：

firefox 29.0.1

C:\D\OA_SVN\PHP\kkdian_pv\www\main\2.js.php->3 ->20140523 03:34:17
C:\D\OA_SVN\PHP\kkdian_pv\www\main\1.js.php->3 ->20140523 03:34:19
C:\D\OA_SVN\PHP\kkdian_pv\www\main\img.php->3 ->20140523 03:34:19

ie 10

C:\D\OA_SVN\PHP\kkdian_pv\www\main\img.php->3 ->20140523 03:33:20
C:\D\OA_SVN\PHP\kkdian_pv\www\main\2.js.php->3 ->20140523 03:33:23
C:\D\OA_SVN\PHP\kkdian_pv\www\main\1.js.php->3 ->20140523 03:33:25

chrome 34.0.1847.137 m

C:\D\OA_SVN\PHP\kkdian_pv\www\main\img.php->3 ->20140523 03:34:46
C:\D\OA_SVN\PHP\kkdian_pv\www\main\2.js.php->3 ->20140523 03:34:49
C:\D\OA_SVN\PHP\kkdian_pv\www\main\1.js.php->3 ->20140523 03:34:51
C:\D\OA_SVN\PHP\kkdian_pv\www\main\img.php->3 ->20140523 03:34:51

safari 5.1.7 windows

C:\D\OA_SVN\PHP\kkdian_pv\www\main\2.js.php->3 ->20140523 03:36:50
C:\D\OA_SVN\PHP\kkdian_pv\www\main\1.js.php->3 ->20140523 03:36:52
C:\D\OA_SVN\PHP\kkdian_pv\www\main\img.php->3 ->20140523 03:36:52

结论：

ie chrome不会阻塞图片加载，firefox safari会阻塞图片加载；但他们都不会阻塞js加载，js加载是多线程的。

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