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UA判断环境，可以判断是否在App内.
App默认自带的UA值（User Agent）为bsljavascript例：<script>varua=navigator.userAgent;if(ua.indexOf("bsl")>=0){alert('App内');}...
App默认自带的UA值（User Agent）为bsljavascript例：<script>varua=navigator.userAgent;if(ua.indexOf("bsl")>=0){alert('App内');}...