1# JavaScript Basic Components 2 3### Introduction 4 5This sample shows the typical effect and usage of basic JavaScript components <button\>,<image\>,<input\>,<test\>,<select\>,<switch\>,<progress\>,<rating\>,<marquee\>,<piece\>,<qrcode\> and <toggle\>. 6 7### Usage 8 9On the home screen of the sample app, you can scroll through the component list and touch each component to view their effect and interaction. You can use and reuse any component anywhere as needed. 10 11### Constraints 12This sample can only be run on standard-system devices.