var lis = document.querySelectorAll(".sci_ban_tit"); //方法三:ES6?let块级作用域 'use?script' for (let i = 0; i < lis.length; i++)?{ lis[i].onmouseover = function ()?{ console.log(i); } }
for循环绑定事件、闭包,了解一下
for (let i = 0; i < lis.length; i++)?{ (function(){lis[i].onmouseover = function ()?{ console.log(i); } })() }
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