下面是一段移动app页面的html
document.getElementById("picture-btn").addEventListener('tap',function () {
var btnArray = [{title:"拍照或录像"},{title:"选取现有的"}];
plus.nativeUI.actionSheet( {
title:"选择照片",
cancel:"取消",
buttons:btnArray
}, function(e){
var index = e.index;
var text = "你刚点击了\"";
switch (index){
case 0:
text += "取消";
break;
case 1:
text += "拍照或录像";
break;
case 2:
text += "选取现有的";
break;
}
info.innerHTML = text+"\"按钮";
} );
});
```
我的html代码中包含了上面这一串代码,然后通过谷歌浏览器运行,会报错
Uncaught ReferenceError: plus is not defined;
请问这是什么原因