小程序九：导航&地图&画布

/** 修改默认的navigator点击态 **/  
.navigator-hover{  
    color:blue;  
}  
/** 自定义其他点击态样式类 **/  
.other-navigator-hover{  
    color:red;  
}  

<view class="btn-area">  
    <navigator url="navigate?title=navigate" hover-class="navigator-hover">跳转到新页面</navigator>  
    <navigator url="redirect?title=redirect" redirect hover-class="other-navigator-hover">在当前页打开</navigator>  
</view>  
</navigator>  
<view style="text-align:center"> {{title}} </view>  
<view> 点击左上角返回回到之前页面 </view>  
  
<view style="text-align:center"> {{title}} </view>  
<view> 点击左上角返回回到上级页面 </view>  

Page({  
  onLoad: function(options) {  
    this.setData({  
      title: options.title  
    })  
  }  
})  

<map longitude="23.099994" latitude="113.324520" markers="{{markers}}" covers="{{covers}}" style="width: 375px; height: 200px;"></map>  

Page({  
  data: {  
    markers: [{  
      latitude: 23.099994,  
      longitude: 113.324520,  
      name: ‘T.I.T 创意园‘,  
      desc: ‘我现在的位置‘  
    }],  
    covers: [{  
      latitude: 23.099794,  
      longitude: 113.324520,  
      icaonPath: ‘../images/car.png‘,  
      rotate: 10  
    }, {  
      latitude: 23.099298,  
      longitude: 113.324129,  
      iconPath: ‘../images/car.png‘,  
      rotate: 90  
    }]  
  }  
})<strong>  
</strong>  

<canvas style="width: 300px; height: 200px;" canvas-id="firstCanvas"></canvas>  
<!-- 当使用绝对定位时，文档流后边的canvas的显示层级高于前边的canvas-->  
<canvas style="width: 400px; height: 500px;" canvas-id="secondCanvas"></canvas>  
<!-- 因为canvas-id与前一个canvas重复，该canvas不会显示，并会发送一个错误事件到AppService -->  
<canvas style="width: 400px; height: 500px;" canvas-id="secondCanvas" binderror="canvasIdErrorCallback"></canvas>  

Page({  
  canvasIdErrorCallback: function (e) {  
    console.error(e.detail.errMsg);  
  },  
  onReady: function (e) {  
  
    //使用wx.createContext获取绘图上下文context  
    var context = wx.createContext();  
  
    context.setStrokeStyle("#00ff00");  
    context.setLineWidth(5);  
    context.rect(0,0,200,200);  
    context.stroke()  
    context.setStrokeStyle ("#ff0000") ;  
    context.setLineWidth (2)  
    context.moveTo(160,100)  
    context.arc(100,100,60,0,2*Math.PI,true);  
    context.moveTo(140,100);  
    context.arc(100,100,40,0,Math.PI,false);  
    context.moveTo(85,80);  
    context.arc(80,80,5,0,2*Math.PI,true);  
    context.moveTo(125,80);  
    context.arc(120,80,5,0,2*Math.PI,true);  
    context.stroke();  
  
    //调用wx.drawCanvas，通过canvasId指定在哪张画布上绘制，通过actions指定绘制行为  
    wx.drawCanvas({  
      canvasId: ‘firstCanvas‘,  
      actions: context.getActions() //获取绘图动作数组  
    });  
  }  
});