监听dom变化v-domResize

export default {
  bind(el, binding) {
    // el为绑定的元素，binding为绑定给指令的对象

    let width = '',
      height = '';
    function isReize() {
      const style = document.defaultView.getComputedStyle(el);
      if (width !== style.width || height !== style.height) {
        binding.value({ width: style.width, height: style.height }); // 关键(这传入的是函数,所以执行此函数)
      }
      width = style.width;
      height = style.height;
    }
    el.__vueSetInterval__ = setInterval(isReize, 300);
  },
  unbind(el) {
    clearInterval(el.__vueSetInterval__);
  }
};

import domResize from './domResize';

const install = function (Vue) {
  Vue.directive('domResize', domResize);
};

if (window.Vue) {
  window['domResize'] = domResize;
  Vue.use(install); // eslint-disable-line
}

domResize.install = install;
export default domResize;