Javascript 请帮助我在react.js中创建图像滑块？ var-workArrays=[{id:1，img:https://scontent-lax3-2.xx.fbcdn.net/v/t1.0-9/117405206_1535037326696077_4967665142447981078_o.png?_nc_cat=111&ccb=2&_nc_sid=730e14&_nc_ohc=XlNXGJF47E0AX8lB1fk&_nc_ht=scontent-lax3-2.xx&oh=d44bd3d97c906f56746b360fc7514c64&oe=5FF77A89“， {id:2，img:“https://scontent-lax3-2.xx.fbcdn.net/v/t1.0-9/117405206_1535037326696077_4967665142447981078_o.png?_nc_cat=111&ccb=2&_nc_sid=730e14&_nc_ohc=XlNXGJF47E0AX8lB1fk&_nc_ht=scontent-lax3-2.xx&oh=d44bd3d97c906f56746b360fc7514c64&oe=5FF77A89“， {id:3，img:“https://scontent-lax3-2.xx.fbcdn.net/v/t1.0-9/117405206_1535037326696077_4967665142447981078_o.png?_nc_cat=111&ccb=2&_nc_sid=730e14&_nc_ohc=XlNXGJF47E0AX8lB1fk&_nc_ht=scontent-lax3-2.xx&oh=d44bd3d97c906f56746b360fc7514c64&oe=5FF77A89“， {id:4，img:“https://scontent-lax3-2.xx.fbcdn.net/v/t1.0-9/117405206_1535037326696077_4967665142447981078_o.png?_nc_cat=111&ccb=2&_nc_sid=730e14&_nc_ohc=XlNXGJF47E0AX8lB1fk&_nc_ht=scontent-lax3-2.xx&oh=d44bd3d97c906f56746b360fc7514c64&oe=5FF77A89“， {id:5，img:“https://scontent-lax3-2.xx.fbcdn.net/v/t1.0-9/117405206_1535037326696077_4967665142447981078_o.png?_nc_cat=111&ccb=2&_nc_sid=730e14&_nc_ohc=XlNXGJF47E0AX8lB1fk&_nc_ht=scontent-lax3-2.xx&oh=d44bd3d97c906f56746b360fc7514c64&oe=5FF77A89“}] var slides=workArrays.length； 类Page1扩展了React.Component{ 建造师（道具）{ 超级（道具）； 此.state={ //SOS：这是我设置的初始状态。 幻灯片：（0） }; this.leftArrow=this.leftArrow.bind（this）； this.rightArrow=this.rightArrow.bind（this）； } 左箭头（）{ 这是我的国家({ //SOS：单击时他们什么也没做 幻灯片：this.state.slides-1 }) } 右箭头（）{ 这是我的国家({ //SOS：我也不想做任何事情 幻灯片：this.state.slides+1 T }) } render（）{ 返回( //SOS：我的左箭头和右箭头也没有出现 {this.props.workArrays.map（函数（work））{ 返回 })} ); } }

您没有正确的变量绑定： 在类构造函数之前定义变量

var workArrays = [{id: 1, img: "https://scontent-lax3-2.xx.fbcdn.net/v/t1.0-9/117405206_1535037326696077_4967665142447981078_o.png?_nc_cat=111&ccb=2&_nc_sid=730e14&_nc_ohc=XlNXGJF47E0AX8lB1fk&_nc_ht=scontent-lax3-2.xx&oh=d44bd3d97c906f56746b360fc7514c64&oe=5FF77A89"}, 
    {id: 2, img: "https://scontent-lax3-2.xx.fbcdn.net/v/t1.0-9/117405206_1535037326696077_4967665142447981078_o.png?_nc_cat=111&ccb=2&_nc_sid=730e14&_nc_ohc=XlNXGJF47E0AX8lB1fk&_nc_ht=scontent-lax3-2.xx&oh=d44bd3d97c906f56746b360fc7514c64&oe=5FF77A89"},
    {id: 3, img: "https://scontent-lax3-2.xx.fbcdn.net/v/t1.0-9/117405206_1535037326696077_4967665142447981078_o.png?_nc_cat=111&ccb=2&_nc_sid=730e14&_nc_ohc=XlNXGJF47E0AX8lB1fk&_nc_ht=scontent-lax3-2.xx&oh=d44bd3d97c906f56746b360fc7514c64&oe=5FF77A89"}, 
    {id: 4, img: "https://scontent-lax3-2.xx.fbcdn.net/v/t1.0-9/117405206_1535037326696077_4967665142447981078_o.png?_nc_cat=111&ccb=2&_nc_sid=730e14&_nc_ohc=XlNXGJF47E0AX8lB1fk&_nc_ht=scontent-lax3-2.xx&oh=d44bd3d97c906f56746b360fc7514c64&oe=5FF77A89"},
    {id: 5, img: "https://scontent-lax3-2.xx.fbcdn.net/v/t1.0-9/117405206_1535037326696077_4967665142447981078_o.png?_nc_cat=111&ccb=2&_nc_sid=730e14&_nc_ohc=XlNXGJF47E0AX8lB1fk&_nc_ht=scontent-lax3-2.xx&oh=d44bd3d97c906f56746b360fc7514c64&oe=5FF77A89"}]

     var slides = workArrays.length;
    class Page1 extends React.Component{
        constructor(props){
            super(props);
            this.state = {
             // SOS: this is the initial state that I have set up.
               slides : (0) 
            };
            this.leftArrow = this.leftArrow.bind(this);
            this.rightArrow = this.rightArrow.bind(this);
        }
            leftArrow(){
                this.setState({
                    // SOS: they are not doing anything when clicked
                    slides: this.state.slides - 1 
                })
            }
            rightArrow(){
                this.setState({
                    // SOS: this want also not doing anything
                    slides: this.state.slides + 1 T
               })

            }
        render(){
        return(
                <div>
                    <Header/>
                    <Hero/>
                    <div>
                        // SOS: Also my left arrown and right arrow are not showing up
                        <button onClick={this.leftArrow}><i className="far fa-arrow-circle-left"></i></button>
                        <button onClick={this.rightArrow}><i className="far fa-arrow-circle-right"></i></button>
                        {this.props.workArrays.map(function(work){
                            return <div key={work.id}>
                                <Services img={work.img}/>
                    </div>
            })}</div>
               </div>
        );
        }
    }

leftSlide和rightSlide函数中有一个bug（您使用状态，其中有一个零）

这就是为什么在this.state.slides中单击左键时显示-1

尝试在左键单击时使用：

this.setState({
 slides: this.state.slides - 1 
});

我建议您将可变幻灯片重命名为SlideCount-这是一种更好的命名约定

如果您希望在左键和右键单击上使用动态滑块，则可以显示单个活动图像，如下所示：

// calculate next slide
var newCurrentSlide = this.state.slides + 1;
// if slide number >= count slides, then get first slide from array
if (newCurrentSlide >= slides){
  newCurrentSlide = 0;
}

this.setState({
 slides: newCurrentSlide
});

render（）{
返回(
);
}

您没有正确的变量绑定： 在类构造函数之前定义变量

var workArrays = [{id: 1, img: "https://scontent-lax3-2.xx.fbcdn.net/v/t1.0-9/117405206_1535037326696077_4967665142447981078_o.png?_nc_cat=111&ccb=2&_nc_sid=730e14&_nc_ohc=XlNXGJF47E0AX8lB1fk&_nc_ht=scontent-lax3-2.xx&oh=d44bd3d97c906f56746b360fc7514c64&oe=5FF77A89"}, 
    {id: 2, img: "https://scontent-lax3-2.xx.fbcdn.net/v/t1.0-9/117405206_1535037326696077_4967665142447981078_o.png?_nc_cat=111&ccb=2&_nc_sid=730e14&_nc_ohc=XlNXGJF47E0AX8lB1fk&_nc_ht=scontent-lax3-2.xx&oh=d44bd3d97c906f56746b360fc7514c64&oe=5FF77A89"},
    {id: 3, img: "https://scontent-lax3-2.xx.fbcdn.net/v/t1.0-9/117405206_1535037326696077_4967665142447981078_o.png?_nc_cat=111&ccb=2&_nc_sid=730e14&_nc_ohc=XlNXGJF47E0AX8lB1fk&_nc_ht=scontent-lax3-2.xx&oh=d44bd3d97c906f56746b360fc7514c64&oe=5FF77A89"}, 
    {id: 4, img: "https://scontent-lax3-2.xx.fbcdn.net/v/t1.0-9/117405206_1535037326696077_4967665142447981078_o.png?_nc_cat=111&ccb=2&_nc_sid=730e14&_nc_ohc=XlNXGJF47E0AX8lB1fk&_nc_ht=scontent-lax3-2.xx&oh=d44bd3d97c906f56746b360fc7514c64&oe=5FF77A89"},
    {id: 5, img: "https://scontent-lax3-2.xx.fbcdn.net/v/t1.0-9/117405206_1535037326696077_4967665142447981078_o.png?_nc_cat=111&ccb=2&_nc_sid=730e14&_nc_ohc=XlNXGJF47E0AX8lB1fk&_nc_ht=scontent-lax3-2.xx&oh=d44bd3d97c906f56746b360fc7514c64&oe=5FF77A89"}]

     var slides = workArrays.length;
    class Page1 extends React.Component{
        constructor(props){
            super(props);
            this.state = {
             // SOS: this is the initial state that I have set up.
               slides : (0) 
            };
            this.leftArrow = this.leftArrow.bind(this);
            this.rightArrow = this.rightArrow.bind(this);
        }
            leftArrow(){
                this.setState({
                    // SOS: they are not doing anything when clicked
                    slides: this.state.slides - 1 
                })
            }
            rightArrow(){
                this.setState({
                    // SOS: this want also not doing anything
                    slides: this.state.slides + 1 T
               })

            }
        render(){
        return(
                <div>
                    <Header/>
                    <Hero/>
                    <div>
                        // SOS: Also my left arrown and right arrow are not showing up
                        <button onClick={this.leftArrow}><i className="far fa-arrow-circle-left"></i></button>
                        <button onClick={this.rightArrow}><i className="far fa-arrow-circle-right"></i></button>
                        {this.props.workArrays.map(function(work){
                            return <div key={work.id}>
                                <Services img={work.img}/>
                    </div>
            })}</div>
               </div>
        );
        }
    }

leftSlide和rightSlide函数中有一个bug（您使用状态，其中有一个零）

这就是为什么在this.state.slides中单击左键时显示-1

尝试在左键单击时使用：

this.setState({
 slides: this.state.slides - 1 
});

我建议您将可变幻灯片重命名为SlideCount-这是一种更好的命名约定

如果您希望在左键和右键单击上使用动态滑块，则可以显示单个活动图像，如下所示：

// calculate next slide
var newCurrentSlide = this.state.slides + 1;
// if slide number >= count slides, then get first slide from array
if (newCurrentSlide >= slides){
  newCurrentSlide = 0;
}

this.setState({
 slides: newCurrentSlide
});

render（）{
返回(
);
}

控制台中有错误吗？没有，当我单击按钮时，它不会转到下一张照片。我在底部标记中输入HTML链接的方式也需要改进，因为它们不会显示为箭头，所以我也需要帮助。

rightArrow

函数中的

T

似乎是一个输入错误？将类名更改为

fas-fa-arrow-circle left

而不是

fa-arrow-circle left

，对右箭头执行同样的操作。控制台中是否有任何错误？否，当我点击按钮时，它不会进入下一张照片。我在底部标签中输入HTML链接的方式也需要改进，因为它们不会显示为箭头，所以我也需要帮助。

rightArrow

函数中的

T

似乎是一个输入错误？将类名更改为

fas-fa-arrow-circle left

而不是

fa-arrow-circle left

，对右箭头执行同样的操作。