vue大屏适配方案

1.锁死分辨率的方式

class DevicePixelRatio {
    constructor() {
      // this.flag = false;
    }
    // 获取系统类型
    _getSystem() {
      let flag = false;
      var agent = navigator.userAgent.toLowerCase();
      //		var isMac = /macintosh|mac os x/i.test(navigator.userAgent);
      //		if(isMac) {
      //			return false;
      //		}
      // 现只针对windows处理，其它系统暂无该情况，如有，继续在此添加
      if (agent.indexOf('windows') >= 0) {
        return true;
      }
    }
    // 获取页面缩放比例
    //	_getDevicePixelRatio() {
    //		let t = this;
    //	}
    // 监听方法兼容写法
    _addHandler(element, type, handler) {
      if (element.addEventListener) {
        element.addEventListener(type, handler, false);
      } else if (element.attachEvent) {
        element.attachEvent('on' + type, handler);
      } else {
        element['on' + type] = handler;
      }
    }
    // 校正浏览器缩放比例
    _correct() {
      let t = this;
      // 页面devicePixelRatio（设备像素比例）变化后，计算页面body标签zoom修改其大小，来抵消devicePixelRatio带来的变化。
      document.getElementsByTagName('body')[0].style.zoom = 1 / window.devicePixelRatio;
      //防止canvas变形
      document.styleSheets[document.styleSheets.length - 1].insertRule('canvas {zoom: ' + 1 / (1 / window.devicePixelRatio) + '}');
    document.styleSheets[document.styleSheets.length - 1].insertRule('canvas {transform: scale(' + 1 / window.devicePixelRatio + ')}');
    document.styleSheets[document.styleSheets.length - 1].insertRule('canvas {transform-origin: 0 0}');
    }
    // 监听页面缩放
    _watch() {
      let t = this;
      t._addHandler(window, 'resize', function() { // 注意这个方法是解决全局有两个window.resize
        // 重新校正
        t._correct()
      })
    }
    // 初始化页面比例
    init() {
      let t = this;
      if (t._getSystem()) { // 判断设备，目前只在windows系统下校正浏览器缩放比例
        // 初始化页面校正浏览器缩放比例
        t._correct();
        // 开启监听页面缩放
        t._watch();
      }
    }
  }
  export default DevicePixelRatio;
  
  

使用：

created() {
    new DevicePixelRatio().init()
  },

2.修改缩放比方式

export const scaleMixin = {
  data() {
    return {
      isScree: false,
    }
  },
  methods: {
    getRatio() {
      var ratio = 0,
        screen = window.screen,
        ua = navigator.userAgent.toLowerCase();

      if (window.devicePixelRatio !== undefined) {
        ratio = window.devicePixelRatio;
      }
      else if (~ua.indexOf('msie')) {
        if (screen.deviceXDPI && screen.logicalXDPI) {
          ratio = screen.deviceXDPI / screen.logicalXDPI;
        }
      }
      else if (window.outerWidth !== undefined && window.innerWidth !== undefined) {
        ratio = window.outerWidth / window.innerWidth;
      }

      if (ratio) {
        ratio = Math.round(ratio * 100);
      }
      console.log(ratio)
      return ratio;
    },
    // 计算缩放比例
    getScaleRatio() {
      const baseWidth = 1920; // 基准宽度
      const baseHeight = 1080; // 基准高度
      const screenWidth = window.innerWidth; // 屏幕宽度
      const screenHeight = window.innerHeight; // 屏幕高度
      console.log(screenWidth)
      const ratioX = screenWidth / baseWidth;
      const ratioY = screenHeight / baseHeight;
      return Math.min(ratioX, ratioY); // 取最小比例作为缩放比例
    },
    onresize(event) {
      // 利用屏幕分辨率和window对象的内高度来判断兼容IE
      let winFlag = window.innerHeight === window.screen.height;
      // 利用window全屏标识来判断 -- IE无效
      let isFull = window.fullScreen || document.webkitIsFullScreen;

      if (isFull === undefined) {
        this.isScree = winFlag;
      } else {
        this.isScree = winFlag || isFull;
      }

      // true全屏   false不是全屏
      if (winFlag == true) {

        const scaleRatio = this.getScaleRatio();
        if(this.$refs.wrapper){
          this.$refs.wrapper.style.transform = `scale(${scaleRatio})`;

        }

      }
      if (winFlag == false) {
        if(this.$refs.wrapper){
          this.$refs.wrapper.style.transform = 'inherit';
        }
      }
    },
  },
  beforeDestroy() {
    // 取消监听事件
    window.removeEventListener("resize", this.onresize);
  },
  mounted() {
    this.getRatio();
    window.addEventListener("resize", this.onresize);
    this.onresize()

  },
};

使用：

mixins: [scaleMixin],