• Breakpoints 屏幕尺寸
• BreakpointObserver 观察器
• MediaMatcher 媒体查询匹配

import { Component, OnInit } from "@angular/core";
import {
  BreakpointObserver,
  BreakpointState,
  MediaMatcher,
  Breakpoints
} from "@angular/cdk/layout";
import { Observable } from "rxjs/Observable";
@Component({
  selector: "layout",
  templateUrl: "./layout.component.html",
  styleUrls: ["./layout.component.scss"]
})
export class LayoutComponent implements OnInit {
  isHandset: Observable<BreakpointState>;
  constructor(public breakpointObserver: BreakpointObserver, public media: MediaMatcher) {}

  ngOnInit() {
    // 手持设备
    let Handset = Breakpoints.Handset;
    // 手持landscape屏
    let HandsetLandscape = Breakpoints.HandsetLandscape;
    //手持portrait屏
    let HandsetPortrait = Breakpoints.HandsetPortrait;
    // 多媒体
    let Medium = Breakpoints.Medium;
    // 平板电脑
    let Tablet = Breakpoints.Tablet;
    // 平板电脑 Landscape
    let TabletLandscape = Breakpoints.TabletLandscape;
    // 平板电脑 Portrait
    let TabletPortrait = Breakpoints.TabletPortrait;
    // web
    let Web = Breakpoints.Web;
    // web landscape
    let WebLandscape = Breakpoints.WebLandscape;
    // web portrait
    let WebPortrait = Breakpoints.WebPortrait;
    // 大屏幕
    let Large = Breakpoints.Large;
    // 更大屏幕
    let XLarge = Breakpoints.XLarge;
    // 更小屏幕
    let XSmall = Breakpoints.XSmall;
    // 小屏幕
    let Small = Breakpoints.Small;

    // 是否满足多个条件
    this.breakpointObserver
      .observe([
        Handset,
        HandsetLandscape,
        Handset,
        Medium,
        Tablet,
        TabletLandscape,
        TabletPortrait,
        Web,
        WebLandscape,
        WebPortrait,
        Large,
        XLarge,
        Small,
        XSmall
      ])
      .subscribe(res => {
        console.log(res);
      });

      this.breakpointObserver
      .observe(Breakpoints.Handset)
        .subscribe((state: BreakpointState) => {
        if (state.matches) {
          console.log('手机设备尺寸内');
        } else {
          console.log('非手机设备尺寸内');
        }
      });

  }
}