当前位置: 首页 > 图文教程 > 网络编程 > Javascript > lib.utf.js

Javascript
页面中body onload 和 window.onload 冲突的问题的解决
OnFocus与OnBlur的例子区别
javascript cloneNode()方法的使用
Javascript 文件夹选择框的两种解决方案
JQuery 风格的HTML文本转义
javascript 验证码生成代码 推荐学习
javascript new 需不需要继续使用
javascript 操作文件 实现方法小结
JavaScript 注册表访问实现代码
javascript web页面刷新的方法收集
Javascript 遍历对象中的子对象
javascript 具名函数的四种调用方式 推荐
javascript 写类方式之一
javascript 写类方式之二
javascript 写类方式之三
javascript 写类方式之四
javascript 写类方式之五
javascript 写类方式之六
javascript 写类方式之七
javascript 写类方式之八

No. « 143 144 145 146 »

技术文章搜索

关键字

Javascript 中的 lib.utf.js

出处:互联网   整理: 软晨网（RuanChen.com）   发布: 2009-09-12   浏览: 345 ::
收藏到网摘: n/a 

/* UTF-8 <=> UTF-16 convertion library.
 *
/* Copyright (C) 1999 Masanao Izumo <[email protected]>
 * 2007 Ma Bingyao <[email protected]>
 * Version: 2.1
 * LastModified: Feb 25, 2007
 * This library is free. You can redistribute it and/or modify it.
 */

/*
 * Interfaces:
 * utf8 = utf16to8(utf16);
 * utf16 = utf16to8(utf8);
 */

function utf16to8(str) {
 if (str.match(/^[\x00-\x7f]*$/) != null) {
 return str;
 }
 var out, i, j, len, c, c2;
 out = [];
 len = str.length;
 for (i = 0, j = 0; i < len; i++, j++) {
 c = str.charCodeAt(i);
 if (c <= 0x7f) {
 out[j] = str.charAt(i);
 }
 else if (c <= 0x7ff) {
 out[j] = String.fromCharCode(0xc0 | (c >>> 6),
 0x80 | (c & 0x3f));
 }
 else if (c < 0xd800 || c > 0xdfff) {
 out[j] = String.fromCharCode(0xe0 | (c >>> 12),
 0x80 | ((c >>> 6) & 0x3f),
 0x80 | (c & 0x3f));
 }
 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] = String.fromCharCode(0xf0 | ((c >>> 18) & 0x3f),
 0x80 | ((c >>> 12) & 0x3f),
 0x80 | ((c >>> 6) & 0x3f),
 0x80 | (c & 0x3f));
 }
 else {
 out[j] = '?';
 }
 }
 else {
 i--;
 out[j] = '?';
 }
 }
 else {
 i--;
 out[j] = '?';
 }
 }
 }
 return out.join('');
}

function utf8to16(str) {
 if ((str.match(/^[\x00-\x7f]*$/) != null) ||
 (str.match(/^[\x00-\xff]*$/) == null)) {
 return str;
 }
 var out, i, j, len, c, c2, c3, c4, s;

 out = [];
 len = str.length;
 i = j = 0;
 while (i < len) {
 c = str.charCodeAt(i++);
 switch (c >> 4) { 
 case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
 // 0xxx xxxx
out[j++] = str.charAt(i - 1);
 break;
 case 12: case 13:
 // 110x xxxx 10xx xxxx
c2 = str.charCodeAt(i++);
 out[j++] = String.fromCharCode(((c & 0x1f) << 6) |
 (c2 & 0x3f));
 break;
 case 14:
 // 1110 xxxx 10xx xxxx 10xx xxxx
c2 = str.charCodeAt(i++);
 c3 = str.charCodeAt(i++);
 out[j++] = String.fromCharCode(((c & 0x0f) << 12) |
 ((c2 & 0x3f) << 6) |
 (c3 & 0x3f));
 break;
 case 15:
 switch (c & 0xf) {
 case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
 // 1111 0xxx 10xx xxxx 10xx xxxx 10xx xxxx
c2 = str.charCodeAt(i++);
 c3 = str.charCodeAt(i++);
 c4 = str.charCodeAt(i++);
 s = ((c & 0x07) << 18) |
 ((c2 & 0x3f) << 12) |
 ((c3 & 0x3f) << 6) |
 (c4 & 0x3f) - 0x10000;
 if (0 <= s && s <= 0xfffff) {
 out[j] = String.fromCharCode(((s >>> 10) & 0x03ff) | 0xd800,
 (s & 0x03ff) | 0xdc00);
 }
 else {
 out[j] = '?';
 }
 break;
 case 8: case 9: case 10: case 11:
 // 1111 10xx 10xx xxxx 10xx xxxx 10xx xxxx 10xx xxxx
i+=4;
 out[j] = '?';
 break;
 case 12: case 13:
 // 1111 110x 10xx xxxx 10xx xxxx 10xx xxxx 10xx xxxx 10xx xxxx
i+=5;
 out[j] = '?';
 break;
 }
 }
 j++;
 }
 return out.join('');
}