原生JS封装Modal弹框

使用原生JS(es5)封装一个属于自己的Modal弹框

效果图展示

主要代码

function Modal(options) {
    options = Object.assign({
      title: '标题',
      backgroundColor: '#fff', // 背景颜色
      mask: true, //是否显示遮罩层,
      content: '弹框内容',
      cancelText: '取消',//取消按钮文字
      okText: '确认', // 确认按钮文字,
      width: 400, //对话框的宽度
      onCancel: this.closeModal, //取消按钮回调，默认是关闭弹框
      onOk: () => {
        console.log('你点击了确认')
      }, // 确认按钮回调
    }, options)
    this.options = options

    // 创建遮罩层
    function createMask() {
      let mask = document.createElement('div')
      mask.className = 'mask'
      document.body.appendChild(mask)
    }

    // 创建modal弹框
    function createModal() {
      let modal = document.createElement('div'),
        titleDom = document.createElement('div'),
        main = document.createElement('div'),
        footer = document.createElement('div'),
        btn_l = document.createElement('button'),
        btn_r = document.createElement('button');

      let { title, content, cancelText, okText, width, onCancel, onOk, backgroundColor
      } = this.options
      modal.className = 'modal'
      modal.style.width = width + 'px'
      modal.style.backgroundColor = backgroundColor

      titleDom.className = 'title'
      let closeIcon = document.createElement('span')
      closeIcon.addEventListener('click', closeModal.bind(this))
      closeIcon.className = 'close'
      closeIcon.innerHTML = 'x'
      titleDom.innerHTML = `${title}`
      titleDom.appendChild(closeIcon)

      main.className = 'main'
      main.innerHTML = content

      footer.className = 'footer'
      btn_l.innerHTML = '取消'
      btn_r.innerHTML = '确认'
      footer.appendChild(btn_l)
      footer.appendChild(btn_r)

      onCancel = onCancel ? onCancel : this.closeModal
      btn_l.addEventListener('click', onCancel.bind(this))
      btn_r.addEventListener('click', onOk)

      modal.appendChild(titleDom)
      modal.appendChild(main)
      modal.appendChild(footer)

      document.body.appendChild(modal)
    }

    // 关闭弹框
    function closeModal(ev) {
      let target = ev.path[2]
      let { mask } = this.options
      mask ? document.body.removeChild(document.querySelector('.mask')) : null
      document.body.removeChild(target)
    }

    // 初始化
    function init() {
      let { mask } = this.options
      mask ? createMask() : null
      this.createModal()
    }

    Modal.prototype.init = init
    Modal.prototype.createModal = createModal
    Modal.prototype.closeModal = closeModal

    // 执行初始化方法
    this.init()
  }

使用的案例

let b = new Modal({
    title: '我是第二个',
    content: `
模态框呀模态框
模态框呀模态框
模态框呀模态框
模态框呀模态框`
  })

模态框样式代码

* {
  padding: 0;
  margin: 0;
}

.mask {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(0, 0, 0, 0.2);
}

.modal {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 400px;
  background-color: aliceblue;
  border-radius: 5px;
  z-index: 99;
  border: 1px solid rgba(0, 0, 0, 0.2);
}

.modal .title {
  height: 30px;
  box-sizing: content-box;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(0, 0, 0, 0.2);
  padding: 0 16px;
}
.title .close {
  width: 20px;
  height: 20px;
  border-radius: 5px;
  line-height: 20px;
  text-align: center;
  font-size: 14px;
  cursor: pointer;
}

.title .close:hover {
  background: rgba(0, 0, 0, 0.2);
}

.modal .main {
  box-sizing: border-box;
  padding: 16px;
  height: calc(100% - 80px);
}

.modal .footer {
  height: 50px;
  text-align: right;
  box-sizing: border-box;
  padding-right: 16px;
  border-top: 1px solid rgba(0, 0, 0, 0.2);
  display: flex;
  align-items: center;
  justify-content: flex-end;
}

.footer button {
  width: 80px;
  height: 30px;
  text-align: center;
  line-height: 30px;
  border: none;
  border-radius: 5px;
  margin-left: 8px;
}

.footer button:hover {
  background-color: #49a4ff;
}

PS：这个样式是我随便写的，后期可根据自己的需求进行更改。第一次封装modal弹框，有不足的地方欢迎帮忙指出来。谢谢