下拉刷新功能

功能初步完成点我预览demo

Name		Name	Last commit message	Last commit date
Latest commit History 5 Commits
.gitignore		.gitignore
README.md		README.md
demo.html		demo.html
index.js		index.js
package.json		package.json
pullRefresh.js		pullRefresh.js
zepto.js		zepto.js

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