用“回退脚本”在Wordpress中从Google库API加载jQuery

Question

我添加了一个Wordpress函数，从谷歌托管的图书馆加载jQuery库

if (!is_admin()) add_action("wp_enqueue_scripts", "my_jquery_enqueue", 11);
function my_jquery_enqueue() {
   wp_deregister_script('jquery');
   wp_register_script('jquery', "http" . ($_SERVER['SERVER_PORT'] == 443 ? "s" : "") . "://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js", false, null);
   wp_enqueue_script('jquery');
}

它创造了这样的东西

<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>

按照html5boilerplate的建议，我如何将其包含在回退选项中

<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script>window.jQuery || document.write('<script src="js/vendor/jquery-1.9.1.min.js"><\/script>')</script>

像这样

Answer 1

尝尝这个。用此代码替换您的代码。这会解决所有问题。

/************* ENQUEUE JS *************************/

/* pull jquery from google's CDN. If it's not available, grab the local copy. */

$url = 'http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js'; // the URL to check against  
$test_url = @fopen($url,'r'); // test parameters  
if( $test_url !== false ) { // test if the URL exists  

    function load_external_jQuery() { // load external file  
        wp_deregister_script( 'jquery' ); // deregisters the default WordPress jQuery  
        wp_register_script('jquery', 'http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js'); // register the external file  
        wp_enqueue_script('jquery'); // enqueue the external file  
    }  

    add_action('wp_enqueue_scripts', 'load_external_jQuery'); // initiate the function  
} else {  

    function load_local_jQuery() {  
        wp_deregister_script('jquery'); // initiate the function  
        wp_register_script('jquery', get_template_directory_uri().'/js/jquery.js', __FILE__, false, '1.7.2', true); // register the local file  

        wp_enqueue_script('jquery'); // enqueue the local file  
    }  

    add_action('wp_enqueue_scripts', 'load_local_jQuery'); // initiate the function  
}  

将此代码放入functions.php中

Answer 2

@Mangesh Parte的Answer可以是short，

<?php
    function load_external_jQuery() {
        wp_deregister_script( 'jquery' ); // deregisters the default WordPress jQuery 
        $url = 'http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js'; // the URL to check against  
        $test_url = @fopen($url,'r'); // test parameters  
        if( $test_url !== false ) { // test if the URL exists if exists then register the external file  
            wp_register_script('jquery', $url);
        }
        else{// register the local file 
            wp_register_script('jquery', get_template_directory_uri().'/js/jquery.js', __FILE__, false, '1.7.2', true);  
        }
        wp_enqueue_script('jquery'); // enqueue the jquery here
    }
    add_action('wp_enqueue_scripts', 'load_external_jQuery'); // initiate the function 
?>

Answer 3

你可以试试这个：

<script>
try { 
        //First check if jQuery exists..
    var test = jQuery.trim("test");
} catch(e) {
        //If it doesn't, add it manually..
    var script = document.createElement("SCRIPT");
    script.setAttribute("src", "js/vendor/jquery-1.9.1.min.js");
    document.head.appendChild(script);
}
</script>