前言：效果是鼠标移入空白区域，边框高亮的效果。效果是在douyin的渡一教育袁老师的课程学习到的，观看以后是一个实用的小特效。想看的可以平台查询，自己也学到了知识。
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<body><div class="card-wrap"><div class="card"><div class="inner">wish you every success</div></div><div class="card"><div class="inner">wish you every success</div></div><div class="card"><div class="inner">wish you every success</div></div><div class="card"><div class="inner">wish you every success</div></div><div class="card"><div class="inner">wish you every success</div></div><div class="card"><div class="inner">wish you every success</div></div></div><script>const cardWrapEl = document.querySelector(".card-wrap")const cardEls = document.querySelectorAll(".card")cardWrapEl.onmousemove = function (e) {for (const card of cardEls) {// getBoundingClientRect提供了元素的大小及其相对于视口的位置。const react = card.getBoundingClientRect()const x = e.clientX - react.left - react.width / 2const y = e.clientY - react.top - react.height / 2card.style.setProperty('--x', `${x}px`)card.style.setProperty('--y', `${y}px`)}}</script>
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运算符，运算符的优先级，隐式转换，强制转换，字符串的+。)
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