1.引入微信jssdk
<script type="text/javascript" src="https://res.wx.qq.com/open/js/jweixin-1.3.2.js"></script>
2.script
<script type="text/javascript">
wx.miniProgram.getEnv(function(res) {
if(res.miniprogram){
// true代表在小程序裏
}else{
//false代表在公衆號裏
}
})
</script>