拖放效果，可以将目标在页面中随意拖放，并实现矢量缩放，可用于多种界面效果。-The drag-and-drop effect, the target can be anywhere in the page drag and drop, and vector scaling can be used for a variety of interface effects.

用canvas画矢量图片可以自动适应缩放 图片不失真-Canvas art Vector Image can automatically adapt to scale the image distortion

SVG 意为可缩放矢量图形（Scalable Vector Graphics）。 SVG 使用 XML 格式定义图像。 压缩包内是SVG的实例和一些具体的应用-SVG means Scalable Vector Graphics (Scalable Vector Graphics). SVG uses XML format definition images. SVG is an instance of the compressed package and some specific a