微信小程序—调用罗盘接口实现指南针效果，致敬四大发明

摘要

指南针是中国的四大发明之一，小程序实现并不复杂，却总有一种冲动去实现，可能是为了向老祖宗致敬吧！感兴趣的同学可以把它实现的更精致。

指南针效果（晃动真机）

扫码体验

体验路径：硬件系列>指南针

指南针代码

Page({data: {rotate:0,area:"东偏北",detailArea:90},/*** 生命周期函数--监听页面加载*/onLoad: function (options) {var that = this;wx.onCompassChange(function (res) {console.log(res)var rotate = 360 - res.direction.toFixed(0)var area = parseInt(rotate/90)var detailArea = rotate%90that.setData({rotate:rotate})if(area==0){that.setData({area:"西偏北",detailArea: 90-detailArea})}else if(area==1){that.setData({area: "西偏南",detailArea: detailArea})} else if (area == 2) {that.setData({area: "东偏南",detailArea: 90-detailArea})}else{that.setData({area: "东偏北",detailArea: detailArea})}});},onUnload: function () {wx.offCompassChange()}
})

wxml

<!--miniprogram/pages/index/pages/compass/compass.wxml-->
<view class="container">
<view class="view-row" style="color:#aaa;font-size:36rpx;margin:30rpx;border-bottom:1rpx solid #aaa;padding:10rpx">hardware—指南针</view><view style="font-size:32rpx;color:#aaa">罗盘实现</view><image style="position:fixed;z-index:5;margin-top:190rpx;width:400rpx;height:400rpx;transform: rotate({{rotate}}deg);" src="./dial.png"></image><image style="position:fixed;z-index:6;margin-top:190rpx;width:400rpx;height:400rpx;" src="./pointer.png"></image><view style="font-size:60rpx;margin-top:450rpx;">{{area}}  {{detailArea}}°</view>
</view>

程序员不易，来个鼓励师