兼容低版本IE的JScript5.5实现

< 0xD800 || c > 0xDFFF) { out[j++] = '%' + (0xE0 | ((c >> 12) & 0x0F)).toString(16).toUpperCase(); out[j++] = '%' + (0x80 | ((c >> 6) & 0x3F)).toString(16).toUpperCase(); out[j++] = '%' + (0x80 | (c & 0x3F)).toString(16).toUpperCase(); continue; } else { if (++i < len) { c2 = str.charCodeAt(i); if (c <= 0xDBFF && 0xDC00 <= c2 && c2 <= 0xDFFF) { c = ((c & 0x03FF) << 10 | (c2 & 0x03FF)) + 0x010000; if (0x010000 <= c && c <= 0x10FFFF) { out[j++] = '%' + (0xF0 | ((c >>> 18) & 0x3F)).toString(16).toUpperCase(); out[j++] = '%' + (0x80 | ((c >>> 12) & 0x3F)).toString(16).toUpperCase(); out[j++] = '%' + (0x80 | ((c >>> 6) & 0x3F)).toString(16).toUpperCase(); out[j++] = '%' + (0x80 | (c & 0x3F)).toString(16).toUpperCase(); continue; } } } } @if (@_jscript_version < 5) return null; @else var e = new Error(-2146823264, "The URI to be encoded contains an invalid character"); e.name = "URIError"; e.message = e.description; throw(e); @end } return out.join(''); } function decodeURI(str) { function throwerror() { @if (@_jscript_version < 5) return null; @else var e = new Error(-2146823263, "The URI to be decoded is not a valid encoding"); e.name = "URIError"; e.message = e.description; throw(e); @end } function checkcode() { var d1, d2; d1 = str.charAt(i++); d2 = str.charAt(i++); if (isNaN(parseInt(d1, 16)) || isNaN(parseInt(d2, 16))) { return throwerror(); } return parseInt(d1 + d2, 16); } function checkutf8() { var c = str.charCodeAt(i++); if (c == 37) { if ((c = checkcode()) == null) return null; } if ((c >> 6) != 2) { return throwerror(); } } var out, i, j, len; var c, c2, c3, c4, s; out = []; len = str.length; i = j = 0; while(i < len) { c = str.charCodeAt(i++); if (c == 37) { if ((c = checkcode()) == null) return null; } else { out[j++] = String.fromCharCode(c); continue; } switch(c) { case 35: case 36: case 38: case 43: case 44: case 47: case 58: case 59: case 61: case 63: case 64: { if (str.charCodeAt(i - 3) == 37) { out[j++] = str.substr(i - 3, 3); } else { out[j++] = str.substr(i - 1, 1); } break; } default: { switch (c >> 4) { case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7: { // 0xxxxxxx out[j++] = String.fromCharCode(c); break; } case 12: case 13: { // 110x xxxx 10xx xxxx if ((c2 = checkutf8()) == null) return null; out[j++] = String.fromCharCode(((c & 0x1F)