升级到 WordPress 5.7.2 之后某些插件报错
Uncaught TypeError: Cannot read property 'msie' of undefined
导致无法运行，原因为
$.browser方法从 jQuery 1.9 开始被移除
而新版本的 WordPress 5.7.2 使用的是 jQuery 3.5 因此上述异常就不足为奇了。
解决方法为在 WordPress 5.7.2 相关主题下，新增如下兼容脚本：
(function(jQuery){
if(jQuery.browser) return;
jQuery.browser = {};
jQuery.browser.mozilla = false;
jQuery.browser.webkit = false;
jQuery.browser.opera = false;
jQuery.browser.msie = false;
let nAgt = navigator.userAgent;
jQuery.browser.name = navigator.appName;
jQuery.browser.fullVersion = ''+parseFloat(navigator.appVersion);
jQuery.browser.majorVersion = parseInt(navigator.appVersion,10);
let nameOffset,verOffset,ix;
// In Opera, the true version is after "Opera" or after "Version"
if ((verOffset=nAgt.indexOf("Opera"))!=-1) {
jQuery.browser.opera = true;
jQuery.browser.name = "Opera";
jQuery.browser.fullVersion = nAgt.substring(verOffset+6);
if ((verOffset=nAgt.indexOf("Version"))!=-1)
jQuery.browser.fullVersion = nAgt.substring(verOffset+8);
}
// In MSIE, the true version is after "MSIE" in userAgent
else if ((verOffset=nAgt.indexOf("MSIE"))!=-1) {
jQuery.browser.msie = true;
jQuery.browser.name = "Microsoft Internet Explorer";
jQuery.browser.fullVersion = nAgt.substring(verOffset+5);
}
// In Chrome, the true version is after "Chrome"
else if ((verOffset=nAgt.indexOf("Chrome"))!=-1) {
jQuery.browser.webkit = true;
jQuery.browser.name = "Chrome";
jQuery.browser.fullVersion = nAgt.substring(verOffset+7);
}
// In Safari, the true version is after "Safari" or after "Version"
else if ((verOffset=nAgt.indexOf("Safari"))!=-1) {
jQuery.browser.webkit = true;
jQuery.browser.name = "Safari";
jQuery.browser.fullVersion = nAgt.substring(verOffset+7);
if ((verOffset=nAgt.indexOf("Version"))!=-1)
jQuery.browser.fullVersion = nAgt.substring(verOffset+8);
}
// In Firefox, the true version is after "Firefox"
else if ((verOffset=nAgt.indexOf("Firefox"))!=-1) {
jQuery.browser.mozilla = true;
jQuery.browser.name = "Firefox";
jQuery.browser.fullVersion = nAgt.substring(verOffset+8);
}
// In most other browsers, "name/version" is at the end of userAgent
else if ( (nameOffset=nAgt.lastIndexOf(' ')+1) <
(verOffset=nAgt.lastIndexOf('/')) )
{
jQuery.browser.name = nAgt.substring(nameOffset,verOffset);
jQuery.browser.fullVersion = nAgt.substring(verOffset+1);
if (jQuery.browser.name.toLowerCase()==jQuery.browser.name.toUpperCase()) {
jQuery.browser.name = navigator.appName;
}
}
// trim the fullVersion string at semicolon/space if present
if ((ix=jQuery.browser.fullVersion.indexOf(";"))!=-1)
jQuery.browser.fullVersion=jQuery.browser.fullVersion.substring(0,ix);
if ((ix=jQuery.browser.fullVersion.indexOf(" "))!=-1)
jQuery.browser.fullVersion=jQuery.browser.fullVersion.substring(0,ix);
jQuery.browser.majorVersion = parseInt(''+jQuery.browser.fullVersion,10);
if (isNaN(jQuery.browser.majorVersion)) {
jQuery.browser.fullVersion = ''+parseFloat(navigator.appVersion);
jQuery.browser.majorVersion = parseInt(navigator.appVersion,10);
}
jQuery.browser.version = jQuery.browser.majorVersion;
})(jQuery);
接着需要在主题的 footer.php 中增加引用，如下：
<!-- 引入兼容性js文件-->
<?php
echo '<script src='.get_theme_file_uri('jquery-browser-compt.js').' type="text/javascript"></script>'
?>
完整的 footer.php ，参考内容如下：
<?php
/**
* The template for displaying the footer
*
* Contains the closing of the "site-content" div and all content after.
*
* @package WordPress
* @subpackage Twenty_Fifteen
* @since Twenty Fifteen 1.0
*/
?>
</div><!-- .site-content -->
<footer id="colophon" class="site-footer" role="contentinfo">
<div class="site-info">
<?php
/*
* Fires before the Twenty Fifteen footer text for footer customization.
*
* @since Twenty Fifteen 1.0
*/
do_action( 'twentyfifteen_credits' );
?>
</div><!-- .site-info -->
</footer><!-- .site-footer -->
</div><!-- .site -->
<?php wp_footer(); ?>
<!-- 引入兼容性js文件-->
<?php
echo '<script src='.get_theme_file_uri('jquery-browser-compt.js').' type="text/javascript"></script>'
?>
</body>
</html>