如果布尔值为true 然后它会一直回来1 或者如果布尔值为false 然后它就会回来empty 这就是为什么你1 如果true.

下面的代码在我的本地项目上进行了测试。复制并粘贴它

//Add it in **functions.php**
function load_localize_scripts() {
    wp_enqueue_script(\'localize_script\', get_template_directory_uri() . \'/js/localize_script.js\', array(), \'1.0.0\', true );
    wp_localize_script(\'localize_script\', \'localize_scripts_vars\', array(
                        \'boolean\' => true, // it will return 1 
                        \'integer\' => 10 // it will always return integre
            )
    );
}
add_action(\'wp_enqueue_scripts\', \'load_localize_scripts\');

//Add this in **localize_script.js**
jQuery(document).ready(function() {
    var site_config;
    if (localize_scripts_vars.boolean == \'1\') {
        site_config = {"boolean":\'true\',"number":localize_scripts_vars.integer};
        console.log(site_config);
    } else if (localize_scripts_vars.boolean == \'\' || localize_scripts_vars.boolean == NULL) {
        site_config = {"boolean":\'false\',"number":localize_scripts_vars.integer};
        console.log(site_config);
    };
});

如果你将布尔型数据包在一个数组中，那么它们会很干净：

$settings = [
  \'booleans\' => [
    \'foo\' => true,
    \'bar\' => false,
  ],
];
wp_localize_script(\'my-script-handle\', \'mySettings\', $settings);

<script type=\'text/javascript\'>
/* <![CDATA[ */
var mySettings = {"booleans":{"foo":true;"bar":false}};
/* ]]> */
</script>

console.log( mySettings.booleans.foo === true ); // true
console.log( mySettings.booleans.bar === false ); // true