事件委托判断为是否为哪个目标节点触发的方法:
ul.onclick = (e) => {
console.log(e.target.innerHTML)
console.log(e.target.tagName)
console.log(e.target.nodeName)
console.log(e.target.id)
console.log(e.target.className
console.log(e.target.childNode
console.log(e.target.parentNode)
}
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