Get total posts number from Tumblr

tumblr_blog_info.js

var totalPosts;

blogInfoCallback = function(data) {
    totalPosts = data.response.blog.posts;
};

jQuery.ajax({
    type: "GET",
    url : "http://api.tumblr.com/v2/blog/_BLOG_URL_/info",
    dataType: "jsonp",
    data: {
        api_key : "API_KEY",
        jsonp : "blogInfoCallback"
    }
});