Method extend

src/dropzone.js:53–61

(target, ...objects)

  // global utility
  static extend(target, ...objects) {
    for (let object of objects) {
      for (let key in object) {
        let val = object[key];
        target[key] = val;
      }
    }
    return target;
  }

  constructor(el, options) {
    super();