1、引入
下載cnpm i viewerjs -S並引入css與js
2、new Viewer(DOM節點，｛配置屬性｝)，例：
屬性只能查文檔：（https://github.com/fengyuanchen/viewerjs/blob/master/README.md）
new Viewer(document.getElementById('aaa'),{
button:true,
navbar:false,
title:true,
toolbar:true,
tooltip:true,
movable:true,
zoomable:true,
rotatable:true,
scalable:true,
transition:true,
fullscreen:true,
keyboard:true,
backdrop:true,
loop:true,
loading:true
})