vant-weapp/dist/dialog/dialog.js

let queue = [];

const Dialog = options => {
  return new Promise((resolve, reject) => {
    const pages = getCurrentPages();
    const ctx = pages[pages.length - 1];

    const dialog = ctx.selectComponent(options.selector);
    delete options.selector;

    if (dialog) {
      dialog.setData({
        onCancel: reject,
        onConfirm: resolve,
        ...options
      });
      queue.push(dialog);
    }
  });
};

Dialog.defaultOptions = {
  show: true,
  title: '',
  message: '',
  overlay: true,
  asyncClose: false,
  selector: '#van-dialog',
  confirmButtonText: '确认',
  cancelButtonText: '取消',
  showConfirmButton: true,
  showCancelButton: false,
  closeOnClickOverlay: false,
  confirmButtonOpenType: ''
};

Dialog.alert = options =>
  Dialog({
    ...Dialog.currentOptions,
    ...options
  });

Dialog.confirm = options =>
  Dialog({
    ...Dialog.currentOptions,
    showCancelButton: true,
    ...options
  });

Dialog.close = () => {
  queue.forEach(dialog => {
    dialog.close();
  });
  queue = [];
};

Dialog.setDefaultOptions = options => {
  Object.assign(Dialog.currentOptions, options);
};

Dialog.resetDefaultOptions = () => {
  Dialog.currentOptions = { ...Dialog.defaultOptions };
};

Dialog.resetDefaultOptions();

export default Dialog;