单例模式：自定义弹框

功能

• 自定义弹框标题
• 自定义弹框内容
• 自定义弹框确认和关闭时的回调函数

完整代码

const Dialog = (function () {
	class Dialog {
	  constructor () {
	    this.ele = document.createElement('div')
	    this.ele.className = 'dialog'
	    document.body.appendChild(this.ele)
	    this.callback = null
	    this.setEvent()
	  }
	
	  setContent ({ text, topicText, confirmText, cancelText } = options) {
	    this.ele.innerHTML = null
	    const top = document.createElement('div')
	    top.className = 'top'
	    const topic = document.createElement('span')
	    topic.className = 'topic'
	    topic.innerHTML = topicText
	    const close = document.createElement('span')
	    close.className = 'close'
	    close.innerHTML = '×'
	    top.appendChild(topic)
	    top.appendChild(close)
	    const middle = document.createElement('div')
	    middle.className = 'middle'
	    const content = document.createElement('div')
	    content.className = 'content'
	    content.innerHTML = text
	    middle.appendChild(content)
	    const bottom = document.createElement('div')
	    bottom.className = 'bottom'
	    const confirm = document.createElement('button')
	    confirm.className = 'confirm'
	    confirm.innerHTML = confirmText
	    const cancel = document.createElement('button')
	    cancel.className = 'cancel'
	    cancel.innerHTML = cancelText
	    bottom.appendChild(confirm)
	    bottom.appendChild(cancel)
	    const wrap = document.createElement('div')
	    this.ele.appendChild(top)
	    this.ele.appendChild(middle)
	    this.ele.appendChild(bottom)
	    this.ele.style.display = 'block'
	  }
	
	  setEvent () {
	    this.ele.addEventListener('click', e => {
	      e = e || window.event
	      const target = e.target || e.srcElement
	      if (target.className === 'close') {
	        this.ele.style.display = 'none'
	        console.log('close')
	      }
	      if (target.className === 'confirm') {
	        this.ele.style.display = 'none'
	        this.callback(true)
	      }
	      if (target.className === 'cancel') {
	        this.ele.style.display = 'none'
	        this.callback(false)
	      }
	    })
	  }
	}
	let instance = null
	return function (options, cb) {
	  if (!instance) instance = new Dialog()
	  instance.setContent(options)
	  instance.callback = cb || function () {}
	  return instance
	}
	})()
	
	const dialog = new Dialog({
	text: '提示文字',
	topicText: '标题',
	confirmText: '确定',
	cancelText: '取消'
	}, res => { console.log(res) })

效果图