📄 overlay.js
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// -*- Java -*-//// Overlay.js, adapted from Floating image II on dynamicdrive.com/* Usage:<html><head><script LANGUAGE="JavaScript1.2" src="overlay.js"></script>...rest of head...</head><body onload="overlaySetup(corner)"><div id="overlayDiv" STYLE="position:absolute;visibility:visible;">...body of overlay...</div>...rest of page...*/var overlayNS4 = document.layers ? 1 : 0;var overlayIE = document.all ? 1 : 0;var overlayNS6 = document.getElementById && !document.all ? 1 : 0;var overlayPadX = 15;var overlayPadY = 15;var overlayDelay = 60;var overlayCorner = 'ur'; // ul, ll, ur, lr, uc, lc, cl, crfunction overlayRefresh() { var overlayLx = 0; var overlayLy = 0; var overlayX = 0; var overlayY = 0; var overlayW = 0; var overlayH = 0; var contentH = 0; var links = document.getElementsByTagName("body")[0]; if (overlayIE) { overlayLx = document.body.clientWidth; overlayLy = document.body.clientHeight; if (document.body.parentElement) { // For IE6 overlayLx = document.body.parentElement.clientWidth; overlayLy = document.body.parentElement.clientHeight; } overlayH = overlayDiv.offsetHeight; overlayW = body.offsetWidth; // overlayDiv.offsetWidth; contentH = body.offsetHeight; } else if (overlayNS4) { overlayLy = window.innerHeight; overlayLx = window.innerWidth; overlayH = document.overlayDiv.clip.height; overlayW = body.clip.width; // document.overlayDiv.clip.width; contentH = body.clip.height; } else if (overlayNS6) { var odiv = document.getElementById('overlayDiv'); overlayLy = window.innerHeight; overlayLx = window.innerWidth; overlayH = odiv.offsetHeight; overlayW = odiv.offsetWidth; // body.offsetWidth; contentH = odiv.offsetHeight; } if (overlayCorner == 'ul') { overlayX = overlayPadX; overlayY = overlayPadY; } else if (overlayCorner == 'cl') { overlayX = overlayPadX; overlayY = (overlayLy - overlayH) / 2; } else if (overlayCorner == 'll') { overlayX = overlayPadX; overlayY = (overlayLy - overlayH) - overlayPadY; } else if (overlayCorner == 'ur') { overlayX = (overlayLx - overlayW) - overlayPadX; overlayY = overlayPadY; } else if (overlayCorner == 'cr') { overlayX = (overlayLx - overlayW) - overlayPadX; overlayY = (overlayLy - overlayH) / 2; } else if (overlayCorner == 'lr') { overlayX = (overlayLx - overlayW) - overlayPadX; overlayY = (overlayLy - overlayH) - overlayPadY; } else if (overlayCorner == 'uc') { overlayX = (overlayLx - overlayW) / 2; overlayY = overlayPadY; } else { // overlayCorner == 'lc' overlayX = (overlayLx - overlayW) / 2; overlayY = (overlayLy - overlayH) - overlayPadY; } if (overlayIE) { overlayDiv.style.left=overlayX; overlayDiv.style.top=overlayY+document.body.scrollTop; if (contentH > overlayLy) { overlayDiv.style.visibility = "hidden"; } } else if (overlayNS4) { document.overlayDiv.pageX=overlayX; document.overlayDiv.pageY=overlayY+window.pageYOffset; document.overlayDiv.visibility="visible"; if (contentH > overlayLy) { document.overlayDiv.style.visibility = "hidden"; } } else if (overlayNS6) { var div = document.getElementById("overlayDiv"); var leftpx = overlayX; var toppx = overlayY+window.pageYOffset; var widthpx = overlayW; div.style.left = leftpx + "px"; div.style.top = toppx + "px"; div.style.width = widthpx + "px"; if (contentH > overlayLy) { div.style.visibility = "hidden"; } else { div.style.visibility = "visible"; } }}function onad() { loopfunc();}function loopfunc() { overlayRefresh(); setTimeout('loopfunc()',overlayDelay);}function overlaySetup(corner) { overlayCorner = corner; if (overlayIE || overlayNS4 || overlayNS6) { onad(); }}⌨️ 快捷键说明
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