同时最多只展示一个toast提示

<div id="app"></div>

const { Component, useState } = React;

let toastInstance = false;
const toast = (text, duration = 1800, container = document.body) => {
  if (toastInstance) {
    return;
  }
  toastInstance = true;
  let div = document.createElement("div");
  div.className = "toast";
  div.style.cssText = `position: fixed;
                                padding: 12px 20px;
                                border-radius: 5px;
                                top: 20px;
                                left: 50%;
                                transform: translate3d(-50%, 0, 0);
                                background-color: rgba(255, 255, 255, 0.96);
                                box-shadow: 0 0 2px #666666;
                                color: #111111;
                                font-size: 16px;
                                line-height: 1.5;
                                white-space: nowrap;
                                text-align: center;`;
  div && (div.innerHTML = text.toString());
  container.appendChild(div);

  return new Promise((resolve) => {
    setTimeout(() => {
      div && div.parentNode && div.parentNode.removeChild(div); // 固定时间后消失
      toastInstance = false;
      resolve();
    }, duration);
  });
};

const sleep = (timeout) => {
  return new Promise((resolve) => {
    setTimeout(() => {
      resolve();
    }, timeout);
  });
};

/**
 * toast的顺序控制
 * 之前是一个toast正在进行中时，其他的toast直接被忽略掉
 * 现在会把将要弹出的toast存储起来，然后按照顺序弹出
 */
let toastList = [];
const toastWaterFall = async (text) => {
  if (toastInstance) {
    toastList.push(text);
  } else {
    await toast(text);
    if (toastList.length) {
      while (toastList.length) {
        await sleep(300);
        await toast(toastList.shift() + "");
      }
    }
  }
};

const Home = () => {
  const [counter, setCounter] = useState(0);
  const hadneOneClick = () => {
    toastWaterFall(counter);
    setCounter(counter + 1);
  };

  return (
    <div className="home">
      <p>同时点击N多下试试！</p>
      <button onClick={hadneOneClick}>同时最多提示一个</button>
    </div>
  );
};

ReactDOM.render(<Home />, document.getElementById("app"));