1金币
最佳答案var warning =document.createElement("div");
warning.innerHTML="作废";
warning.id = "watermark";
warning.style.fontSize="24px";
warning.style.color="red";
warning.style.transform="rotate(-45deg)";
warning.style.position="absolute";
//
const box=document.getElementById('r4c20p')// 获取元素
const ct = box.getBoundingClientRect().top // 元素上边距离页面可视区上边的距离
const cl = box.g ...
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