需要帮助来反转横幅循环JavaScript

问题描述 投票：0回答：1

所有，我一直在绞尽脑汁比我更关心，承认试图扭转这个功能。我有一个循环设置，所以我的幻灯片开始加载，停止悬停，并可以使用下一个和上一个按钮导航。当您切换方向时，幻灯片从两个方向来回并重置为一个。

我很确定这与var bannerStatus是一个全局变量有关，并在改变方向时重置为1。有没有办法让值不重置？我可以使用函数永久更新全局变量，还是应该创建一个双向的巨大函数？这是我的banner.js这个项目。

var bannerStatus = 1;
var bannerTimer = 3000;

window.onload = function() {
  bannerLoop();
}

var startBannerLoop = setInterval(function() {
  bannerLoop();
}, bannerTimer);

document.getElementById("imgtabs").onmouseenter = function() {
  clearInterval(startBannerLoop);
}

document.getElementById("imgtabs").onmouseleave = function() {
  startBannerLoop = setInterval(function() {
    bannerLoop();
  }, bannerTimer);
}



function bannerLoop() {

  if (bannerStatus === 1) {

    document.getElementById("ban2").style.opacity = "0";
    setTimeout(function() {
      document.getElementById("ban3").style.right = "100%";
      document.getElementById("ban3").style.zIndex = "900";
      document.getElementById("ban1").style.right = "0px";
      document.getElementById("ban1").style.zIndex = "1000";
      document.getElementById("ban2").style.right = "-100%";
      document.getElementById("ban2").style.zIndex = "1100";

    }, 500);

    setTimeout(function() {
      document.getElementById("ban2").style.opacity = "1";
    }, 1000);

    bannerStatus++;
  } else if (bannerStatus === 2) {

    document.getElementById("ban3").style.opacity = "0";
    setTimeout(function() {
      document.getElementById("ban1").style.right = "100%";
      document.getElementById("ban1").style.zIndex = "900";
      document.getElementById("ban2").style.right = "0px";
      document.getElementById("ban2").style.zIndex = "1000";
      document.getElementById("ban3").style.right = "-100%";
      document.getElementById("ban3").style.zIndex = "1100";

    }, 500);

    setTimeout(function() {
      document.getElementById("ban3").style.opacity = "1";
    }, 1000);

    bannerStatus++;
  } else if (bannerStatus === 3) {

    document.getElementById("ban1").style.opacity = "0";
    setTimeout(function() {
      document.getElementById("ban2").style.right = "100%";
      document.getElementById("ban2").style.zIndex = "900";
      document.getElementById("ban3").style.right = "0px";
      document.getElementById("ban3").style.zIndex = "1000";
      document.getElementById("ban1").style.right = "-100%";
      document.getElementById("ban1").style.zIndex = "1100";

    }, 500);

    setTimeout(function() {
      document.getElementById("ban1").style.opacity = "1";
    }, 1000);

    bannerStatus = 1;
  }
}

function reverseBanner() {
  if (bannerStatus === 1) {

    document.getElementById("ban3").style.opacity = "0";
    setTimeout(function() {
      document.getElementById("ban3").style.right = "100%";
      document.getElementById("ban3").style.zIndex = "900";
      document.getElementById("ban1").style.right = "0px";
      document.getElementById("ban1").style.zIndex = "1000";
      document.getElementById("ban2").style.right = "-100%";
      document.getElementById("ban2").style.zIndex = "1100";

    }, 500);

    setTimeout(function() {
      document.getElementById("ban3").style.opacity = "1";
    }, 1000);

    bannerStatus++;
  } else if (bannerStatus === 2) {

    document.getElementById("ban2").style.opacity = "0";
    setTimeout(function() {
      document.getElementById("ban2").style.right = "100%";
      document.getElementById("ban2").style.zIndex = "900";
      document.getElementById("ban3").style.right = "0px";
      document.getElementById("ban3").style.zIndex = "1000";
      document.getElementById("ban1").style.right = "-100%";
      document.getElementById("ban1").style.zIndex = "1100";

    }, 500);

    setTimeout(function() {
      document.getElementById("ban2").style.opacity = "1";
    }, 1000);

    bannerStatus++;
  } else if (bannerStatus === 3) {

    document.getElementById("ban1").style.opacity = "0";
    setTimeout(function() {
      document.getElementById("ban1").style.right = "100%";
      document.getElementById("ban1").style.zIndex = "900";
      document.getElementById("ban2").style.right = "0px";
      document.getElementById("ban2").style.zIndex = "1000";
      document.getElementById("ban3").style.right = "-100%";
      document.getElementById("ban3").style.zIndex = "1100";

    }, 500);

    setTimeout(function() {
      document.getElementById("ban1").style.opacity = "1";
    }, 1000);

    bannerStatus = 1;

  }

  document.getElementById("nxtbtn").onclick = function() {
    bannerLoop();
  }

  document.getElementById("prvbtn").onclick = function() {
    reverseBanner();
  }
#imgtabs {
  background-color: hsl(43, 0%, 93%);
  height: 250px;
  width: 100%;
  overflow: hidden;
  position: relative;
}

.tab {
  height: 100%;
  width: 100%;
  position: absolute;
  top: 0px;
  transition: all ease-in-out 500ms;
}

#ban1 {
  background-image: url(imgs/Romans%20Group.jpg);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

#ban2 {
  background-image: url(imgs/AlphaMailTruck.jpg);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

#ban3 {
  background-image: url(imgs/Romans%20Group.jpg);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.tab h3 {
  position: absolute;
  right: 5%;
  bottom: 2%;
  color: white;
}

.imgbtn {
  height: 40px;
  width: 40px;
  position: absolute;
  top: 50%;
  z-index: 1200;
  cursor: pointer;
}

.imgbtn:hover {
  opacity: 0.9;
}

.prvbtn {
  left: 5px;
}

.nxtbtn {
  right: 5px;
}
<html>

<body>
  <div id="imgtabs">

    <div class="tab" id="ban1">
      <h3>First</h3>
    </div>

    <div class="tab" id="ban2">
      <h3>Second</h3>
    </div>

    <div class="tab" id="ban3">
      <h3>Third</h3>
    </div>

    <a class="imgbtn prvbtn" id="prvbtn">&#10094;</a>
    <a class="imgbtn nxtbtn" id="nxtbtn">&#10095;</a>

  </div>
</body>

</html>
javascript function loops slideshow reverse
1个回答
0
投票

If Something is Reversed Then Go the Opposite Direction

document.getElementById("ban1").style.left

演示

var bannerStatus = 1;
var bannerTimer = 3000;

window.onload = function() {
  bannerLoop();
}

var startBannerLoop = setInterval(function() {
  bannerLoop();
}, bannerTimer);

document.getElementById("imgtabs").onmouseenter = function() {
  clearInterval(startBannerLoop);
}

document.getElementById("imgtabs").onmouseleave = function() {
  startBannerLoop = setInterval(function() {
    bannerLoop();
  }, bannerTimer);
}



function bannerLoop() {

  if (bannerStatus === 1) {

    document.getElementById("ban2").style.opacity = "0";
    setTimeout(function() {
      document.getElementById("ban3").style.right = "100%";
      document.getElementById("ban3").style.zIndex = "900";
      document.getElementById("ban1").style.right = "0px";
      document.getElementById("ban1").style.zIndex = "1000";
      document.getElementById("ban2").style.right = "-100%";
      document.getElementById("ban2").style.zIndex = "1100";

    }, 500);

    setTimeout(function() {
      document.getElementById("ban2").style.opacity = "1";
    }, 1000);

    bannerStatus++;
  } else if (bannerStatus === 2) {

    document.getElementById("ban3").style.opacity = "0";
    setTimeout(function() {
      document.getElementById("ban1").style.right = "100%";
      document.getElementById("ban1").style.zIndex = "900";
      document.getElementById("ban2").style.right = "0px";
      document.getElementById("ban2").style.zIndex = "1000";
      document.getElementById("ban3").style.right = "-100%";
      document.getElementById("ban3").style.zIndex = "1100";

    }, 500);

    setTimeout(function() {
      document.getElementById("ban3").style.opacity = "1";
    }, 1000);

    bannerStatus++;
  } else if (bannerStatus === 3) {

    document.getElementById("ban1").style.opacity = "0";
    setTimeout(function() {
      document.getElementById("ban2").style.right = "100%";
      document.getElementById("ban2").style.zIndex = "900";
      document.getElementById("ban3").style.right = "0px";
      document.getElementById("ban3").style.zIndex = "1000";
      document.getElementById("ban1").style.right = "-100%";
      document.getElementById("ban1").style.zIndex = "1100";

    }, 500);

    setTimeout(function() {
      document.getElementById("ban1").style.opacity = "1";
    }, 1000);

    bannerStatus = 1;
  }
}

function reverseBanner() {
  if (bannerStatus === 1) {

    document.getElementById("ban3").style.opacity = "0";
    setTimeout(function() {
      document.getElementById("ban3").style.left = "100%";
      document.getElementById("ban3").style.zIndex = "900";
      document.getElementById("ban1").style.left = "0px";
      document.getElementById("ban1").style.zIndex = "1000";
      document.getElementById("ban2").style.left = "-100%";
      document.getElementById("ban2").style.zIndex = "1100";

    }, 500);

    setTimeout(function() {
      document.getElementById("ban3").style.opacity = "1";
    }, 1000);

    bannerStatus++;
  } else if (bannerStatus === 2) {

    document.getElementById("ban2").style.opacity = "0";
    setTimeout(function() {
      document.getElementById("ban2").style.left = "100%";
      document.getElementById("ban2").style.zIndex = "900";
      document.getElementById("ban3").style.left = "0px";
      document.getElementById("ban3").style.zIndex = "1000";
      document.getElementById("ban1").style.left = "-100%";
      document.getElementById("ban1").style.zIndex = "1100";

    }, 500);

    setTimeout(function() {
      document.getElementById("ban2").style.opacity = "1";
    }, 1000);

    bannerStatus++;
  } else if (bannerStatus === 3) {

    document.getElementById("ban1").style.opacity = "0";
    setTimeout(function() {
      document.getElementById("ban1").style.left = "100%";
      document.getElementById("ban1").style.zIndex = "900";
      document.getElementById("ban2").style.left = "0px";
      document.getElementById("ban2").style.zIndex = "1000";
      document.getElementById("ban3").style.left = "-100%";
      document.getElementById("ban3").style.zIndex = "1100";

    }, 500);

    setTimeout(function() {
      document.getElementById("ban1").style.opacity = "1";
    }, 1000);

    bannerStatus = 1;

  }

  document.getElementById("nxtbtn").onclick = function() {
    bannerLoop();
  }

  document.getElementById("prvbtn").onclick = function() {
    reverseBanner();
  }
}
#imgtabs {
  background-color: hsl(43, 0%, 93%);
  height: 250px;
  width: 100%;
  overflow: hidden;
  position: relative;
}

.tab {
  height: 100%;
  width: 100%;
  position: absolute;
  top: 0px;
  transition: all ease-in-out 500ms;
}

#ban1 {
  background-image: url(https://i.ibb.co/5LPXSfn/Lenna-test-image.png);
  background-size: contain;
  background-position: center;
  background-repeat: no-repeat;
}

#ban2 {
  background-image: url(https://i.ibb.co/tmQZgJb/68eb2df1a189f88bb0cbd47a3e00c112.png);
  background-size: contain;
  background-position: center;
  background-repeat: no-repeat;
}

#ban3 {
  background-image: url(https://i.ibb.co/ZHvWsKb/o1z7p.jpg);
  background-size: contain;
  background-position: center;
  background-repeat: no-repeat;
}

.tab h3 {
  position: absolute;
  right: 5%;
  bottom: 2%;
  color: white;
}

.imgbtn {
  height: 40px;
  width: 40px;
  position: absolute;
  top: 50%;
  z-index: 1200;
  cursor: pointer;
}

.imgbtn:hover {
  opacity: 0.9;
}

.prvbtn {
  left: 5px;
}

.nxtbtn {
  right: 5px;
}
<html>

<body>
  <div id="imgtabs">

    <div class="tab" id="ban1">
      <h3>First</h3>
    </div>

    <div class="tab" id="ban2">
      <h3>Second</h3>
    </div>

    <div class="tab" id="ban3">
      <h3>Third</h3>
    </div>

    <a class="imgbtn prvbtn" id="prvbtn">&#10094;</a>
    <a class="imgbtn nxtbtn" id="nxtbtn">&#10095;</a>

  </div>
</body>

</html>
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