使用如下函数将元素加载到常量中：

const postSelections = [];

const allPosts = wp.apiFetch({path: "/wp/v2/posts"}).then(posts => {
    postSelections.push({label: "Select a Post", value: 0});
    $.each( posts, function( key, val ) {
        postSelections.push({label: val.title.rendered, value: val.id});
    });
    return postSelections;
});

                    el(
                        wp.components.SelectControl,
                        {
                            label: __(\'Select a Post\'),
                            help: \'Select a post to display as a banner.\',
                            options: postSelections,
                            value: selectedPost,
                            onChange: onChangePost
                        }
                    ),