// 給任意dom設置一個蒙層,並使蒙層區域不可點擊
function showmask(dom) {
var domRect = dom.getBoundingClientRect(),
domTop = domRect.top + window.pageYOffset,
domLeft = domRect.left + window.pageXOffset;
var maskDiv = document.createElement("div");
maskDiv.style.width = domRect.width + "px";
maskDiv.style.height = domRect.height + "px";
maskDiv.style.top = domTop + "px";
maskDiv.style.left = domLeft + "px";
maskDiv.style.background = "#000";
maskDiv.style.opacity = "0.5";
maskDiv.style.position = "absolute";
maskDiv.style.zIndex = 999;
document.body.appendChild(maskDiv);
}
setMask的實現
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