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【JavaScript】js实现十六进制与浮点数的转换
来自ampedZ的博客园，原文地址：http://www.cnblogs.com/ampedZ/p/HexToSingle.html
基于IEEE 745标准的Hex与Single的转换，并加入了一定的防错处理。
<!DOCTYPE html><html><head><style type="text/css">div#divBase{text-align:center;width:283px;}div#divTitle{clear:both;text-align:center;padding:3px;}div#divInput{float:left;}div#divOutput{float:right;}div#divButton{float:none;vertical-align:middle;margin:36px;}div#divCopyright{clear:both;text-align:center;padding:3px;}textarea#textareaInput{resize:none;overflow:auto;width:106px;height:126px;}textarea#textareaOutput{resize:none;overflow:auto;width:106px;height:126px;}</style></head><body><div id="divBase"><div id="divTitle">十六进制浮点数转换</div><div id="divInput"><textarea id="textareaInput"wrap="soft">42 0C 00 0042 82 00 00</textarea></div><div id="divOutput"><textarea id="textareaOutput"wrap="soft">3565</textarea></div><div id="divButton"><input type="button"value=" ＝》"onClick="ConvertToSingle()"/><input type="button"value="《＝ "onClick="ConvertToHex()"/></div><div id="divCopyright">Copyright © 心のsky Group</div></div><script type="text/javascript"src="HexToSingle.js"></script><script type="text/javascript">function ConvertToSingle(){var t=document.getElementById("textareaInput").value;t=HexToSingleBatch(t);document.getElementById("textareaOutput").value=t;}function ConvertToHex(){var t=document.getElementById("textareaOutput").value;t=SingleToHexBatch(t);document.getElementById("textareaInput").value=t;}</script></body></html>
function InsertString(t, c, n) { var r = new Array(); for (var i = 0; i * 2 < t.length; i++) { r.push(t.substr(i * 2, n)); } return r.join(c);}function FillString(t, c, n, b) { if ((t == "") || (c.length != 1) || (n <= t.length)) { return t; } var l = t.length; for (var i = 0; i < n - l; i++) { if (b == true) { t = c + t; } else { t += c; } } return t;}function HexToSingle(t) { t = t.replace(/\s+/g, ""); if (t == "") { return ""; } if (t == "00000000") { return "0"; } if ((t.length > 8) || (isNaN(parseInt(t, 16)))) { return "Error"; } if (t.length < 8) { t = FillString(t, "0", 8, true); } t = parseInt(t, 16).toString(2); t = FillString(t, "0", 32, true); var s = t.substring(0, 1); var e = t.substring(1, 9); var m = t.substring(9); e = parseInt(e, 2) - 127; m = "1" + m; if (e >= 0) { m = m.substr(0, e + 1) + "." + m.substring(e + 1) } else { m = "0." + FillString(m, "0", m.length - e - 1, true) } if (m.indexOf(".") == -1) { m = m + ".0"; } var a = m.split("."); var mi = parseInt(a[0], 2); var mf = 0; for (var i = 0; i < a[1].length; i++) { mf += parseFloat(a[1].charAt(i)) * Math.pow(2, -(i + 1)); } m = parseInt(mi) + parseFloat(mf); if (s == 1) { m = 0 - m; } return m;}function SingleToHex(t) { if (t == "") { return ""; } t = parseFloat(t); if (isNaN(t) == true) { return "Error"; } if (t == 0) { return "00000000"; } var s, e, m; if (t > 0) { s = 0; } else { s = 1; t = 0 - t; } m = t.toString(2); if (m >= 1) { if (m.indexOf(".") == -1) { m = m + ".0"; } e = m.indexOf(".") - 1; } else { e = 1 - m.indexOf("1"); } if (e >= 0) { m = m.replace(".", ""); } else { m = m.substring(m.indexOf("1")); } if (m.length > 24) { m = m.substr(0, 24); } else { m = FillString(m, "0", 24, false) } m = m.substring(1); e = (e + 127).toString(2); e = FillString(e, "0", 8, true); var r = parseInt(s + e + m, 2).toString(16); r = FillString(r, "0", 8, true); return InsertString(r, " ", 2).toUpperCase();}function FormatHex(t, n, ie) { var r = new Array(); var s = ""; var c = 0; for (var i = 0; i < t.length; i++) { if (t.charAt(i) != " ") { s += t.charAt(i); c += 1; if (c == n) { r.push(s); s = ""; c = 0; } } if (ie == false) { if ((i == t.length - 1) && (s != "")) { r.push(s); } } } return r.join("\n");}function FormatHexBatch(t, n, ie) { var a = t.split("\n"); var r = new Array(); for (var i = 0; i < a.length; i++) { r[i] = FormatHex(a[i], n, ie); } return r.join("\n");}function HexToSingleBatch(t) { var a = FormatHexBatch(t, 8, true).split("\n"); var r = new Array(); for (var i = 0; i < a.length; i++) { r[i] = HexToSingle(a[i]); } return r.join("\r\n");}function SingleToHexBatch(t) { var a = t.split("\n"); var r = new Array(); for (var i = 0; i < a.length; i++) { r[i] = SingleToHex(a[i]); } return r.join("\r\n");}
【JavaScript】js实现十六进制与浮点数的转换
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