implement pinch to zoom

node_modules/prop-detect/Readme.md

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+# prop-detect
+
+[![Build Status](https://secure.travis-ci.org/chemzqm/prop-detect.svg)](http://travis-ci.org/chemzqm/prop-detect)
+
+  Detect animation properties, it's annoying to install each of them.
+  :smiley:
+
+## Install
+
+    npm i prop-detect -S
+
+## Usage
+
+``` js
+var detect = require('prop-detect')
+var transform = detect.transform
+var transition = detect.transition
+var touchAction = detect.touchAction
+var transitionend = detect.transitionend
+var has3d = detect.has3d // true or false
+```
+
+## API
+
+* `transform` style name
+* `transition` style name
+* `touchAction` style name
+* `transitionend` event name
+* `has3d` true of false