<div className={classes.root}>
          <AppBar position="static">
            <Tabs variant="fullWidth" value={value} onChange={this.handleChange}>
              <LinkTab label="Page One" href="page1" />
              <LinkTab label="Page Two" href="page2" />
              <LinkTab label="Page Three" href="page3" />
            </Tabs>
          </AppBar>
          {value === 0 && <TabContainer>Page One</TabContainer>}
          {value === 1 && <TabContainer>Page Two</TabContainer>}
          {value === 2 && <TabContainer>Page Three</TabContainer>}
        </div>

variant="fullWidth"是关键