前提修改文档声明，如有疑问，请看文章手机web2.0网页文档属性
@media screen and (max-device- 320px){body{-webkit-text-size-adjust:none}}
@media screen and (max-device- 480px){body{-webkit-text-size-adjust:none}}
@media only screen and (-webkit-min-device-pixel-ratio: 2){body{-webkit-text-size-adjust:none}}
@media only screen and (min-device- 768px) and (max-device- 1024px){body{-webkit-text-size-adjust:none}}
如有想进一步了解，请看上一篇Media Queries详解