使用chooseImage选择图片后无法立即显示提示。

    wx.chooseImage({

    count: 1,

    sizeType: [‘original’],

    sourceType: [‘album’, ‘camera’],

    success: function(res) {

            wx.showToast({

                    title: ‘请稍后…’,

                    icon: ‘loading’,

                    mask: true

            });

    });