class Util {

    inject() {
        Element.prototype.remove = function (removeClassName) {
            this.classList.remove(removeClassName);
        }
        Element.prototype.add = function (addClassName) {
            this.classList.add(addClassName);
        }
        HTMLElement.prototype.text = function (text) {
            this.innerText = text;
        }
    }

    query(name) {
        var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)");
        var r = window.location.search.substr(1).match(reg);
        if (r != null) return unescape(r[2]); return null;
    }

    click(className, callback) {
        $(className).onclick = (e) => {
            callback(e)
        }
    }

    $(className) {
        return document.querySelector(className)
    }

    _(className) {
        return document.querySelectorAll(className)
    }
}

var { $, _, click, inject, query } = new Util()

inject()