Method back

javascript/08_stack/SampleBrowser.js:20–28

()

    }
    // 后退
    back() {
        const value = this.normalStack.pop()
        if (value !== -1) {
            this.backStack.push(value)
            this.displayAllStack()
        } else {
            console.log('无法后退')
        }
    }
    // 前进
    front() {
        const value = this.backStack.pop()