JS 实现自定义弹窗

复制下面代码到浏览器的控制台 直接可以使用

/**
 *自定义的alert弹窗
 * @param title 标题
 * @param infoContent 需要显示的提示信息
 * @param OkBtnContent 确定按钮的文本信息
 * @param calcelBtnContent 取消按钮的文本信息
 */
function MyAlert(title,infoContent,OkBtnContent,calcelBtnContent) {
  return new Promise(function (resolve) {
    const confirmWrap = document.createElement('div')
    confirmWrap.className = 'MyAlertBox'
    const style = document.createElement('style')
    style.innerHTML = `
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.postbird-box-container {
    width: 100%;
    height: 100%;
    overflow: hidden;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 210000001;
    background-color: rgba(0, 0, 0, 0.2);
    display: block;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

.postbird-box-container.active {
    display: block;
}

.postbird-box-content {
    width: 400px;
    max-width: 90%;
    min-height: 150px;
    background-color: #fff;
    border: solid 1px #dfdfdf;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    /* margin-top: -100px; */
}

.postbird-box-header {
    width: 100%;
    padding: 10px 15px;
    position: relative;
    font-size: 1.1em;
    letter-spacing: 2px;
}

.postbird-box-close-btn {
    cursor: pointer;
    font-weight: 700;
    color: #000;
    float: right;
    opacity: 0.5;
    font-size: 1.3em;
    margin-top: -3px;
    display: none;
}

.postbird-box-close-btn:hover {
    opacity: 1;
}

.postbird-box-text {
  width: 100%;
  padding: 0 10%;
  text-align: center;
  line-height: 15px;
  font-size: 14px;
  letter-spacing: 1px;
}

.postbird-box-footer {
    width: 100%;
    position: absolute;
    bottom: 0;
    padding: 0;
    margin: 0;
    display: flex;
    display: -webkit-flex;
    justify-content: space-around;
    border-top: solid 1px #dfdfdf;
    align-items: flex-end;
}

.postbird-box-footer .btn-footer {
    line-height: 44px;
    border: 0;
    cursor: pointer;
    background-color: #fff;
    color: #0e90d2;
    font-size: 1.1em;
    letter-spacing: 2px;
    transition: background-color .5s;
    -webkit-transition: background-color .5s;
    -o-transition: background-color .5s;
    -moz-transition: background-color .5s;
    outline: 0;
}

.postbird-box-footer .btn-footer:hover {
    background-color: #e5e5e5;
}

.postbird-box-footer .btn-block-footer {
    width: 100%;
}

.postbird-box-footer .btn-left-footer,
.postbird-box-footer .btn-right-footer {
    position: relative;
    width: 100%;
}

.postbird-box-footer .btn-left-footer::after {
    content: "";
    position: absolute;
    right: 0;
    top: 0;
    background-color: #e5e5e5;
    height: 100%;
    width: 1px;
}

.postbird-box-footer .btn-footer-cancel {
    color: #333333;
}

.postbird-prompt-input {
    width: 100%;
    font-size: 16px;
    border: 1px solid #cccccc;
    outline: none;
    padding:5px 10px 5px 10px;
}`
    confirmWrap.innerHTML = `
<div class="postbird-box-container active">
    <div class="postbird-box-container">
        <div class="postbird-box-dialog">
            <div class="postbird-box-content">
                <div class="postbird-box-header">
                <span class="postbird-box-close-btn">×</span>
                <span class="postbird-box-title">
                    <span >${title}</span>
                </span>
                </div>
                <div class="postbird-box-text"><span style="color:red;">${infoContent}</span>
                </div>
                <div class="postbird-box-footer">
                <button class="btn-footer btn-left-footer btn-footer-cancel" style="color:undefined;">${calcelBtnContent}</button>
                <button class="btn-footer btn-right-footer btn-footer-ok" style="color:#0e90d2;">${OkBtnContent}</button>
                </div>
            </div>
        </div>
    </div>
</div>`

    document.getElementsByTagName('head').item(0).appendChild(style)
    document.body.appendChild(confirmWrap)

    const okBtn = document.getElementsByClassName('btn-footer-ok')
    okBtn[okBtn.length - 1].focus()
    okBtn[okBtn.length - 1].onclick = function () {
      console.log('点击了确定')
      const box = document.getElementsByClassName('MyAlertBox')

      document.body.removeChild(box[box.length - 1])
      resolve(1)
    }
    const cancelBtn = document.getElementsByClassName('btn-footer-cancel')
    cancelBtn[cancelBtn.length - 1].onclick = function () {
      console.log('点击了取消')
      const box = document.getElementsByClassName('MyAlertBox')
      document.body.removeChild(box[box.length - 1])
      resolve(0)
    }
  })
}

//调用
MyAlert('提示','这里是具体显示的信息','取消','确定').then(result=>{
console.log('这里是点击了确定或者取消按钮后续的操作')
console.log('result' + result)
})

效果图：