问题是 Rangy 的保存/恢复选择module的工作方式是将不可见的标记元素插入到选择边界所在的 DOM 中，然后您的代码删除所有 HTML 标记，包括 Rangy 的标记元素（如错误消息所示）。您有两个选择：

1. 转向 DOM 遍历解决方案来为数字着色，而不是innerHTML. 这将更可靠，但更多参与。
2. 实现另一种基于字符索引的选择保存和恢复。这通常是脆弱的，但在这种情况下会做你想做的。

更新

我已经为 Rangy 敲了一个基于字符索引的选择保存/恢复（上面的选项 2）。这有点粗糙，但它可以完成这种情况。它通过遍历文本节点来工作。我可能会以某种形式将其添加到 Rangy 中。（2012 年 6 月 5 日更新： 我现在已经以更可靠的方式为 Rangy 实现了这一点。）

jsFiddle：http : //jsfiddle.net/2rTA5/2/

代码：

function saveSelection(containerEl) {
    var charIndex = 0, start = 0, end = 0, foundStart = false, stop = {};
    var sel = rangy.getSelection(), range;

    function traverseTextNodes(node, range) {
        if (node.nodeType == 3) {
            if (!foundStart && node == range.startContainer) {
                start = charIndex + range.startOffset;
                foundStart = true;
            }
            if (foundStart && node == range.endContainer) {
                end = charIndex + range.endOffset;
                throw stop;
            }
            charIndex += node.length;
        } else {
            for (var i = 0, len = node.childNodes.length; i < len; ++i) {
                traverseTextNodes(node.childNodes[i], range);
            }
        }
    }

    if (sel.rangeCount) {
        try {
            traverseTextNodes(containerEl, sel.getRangeAt(0));
        } catch (ex) {
            if (ex != stop) {
                throw ex;
            }
        }
    }

    return {
        start: start,
        end: end
    };
}

function restoreSelection(containerEl, savedSel) {
    var charIndex = 0, range = rangy.createRange(), foundStart = false, stop = {};
    range.collapseToPoint(containerEl, 0);

    function traverseTextNodes(node) {
        if (node.nodeType == 3) {
            var nextCharIndex = charIndex + node.length;
            if (!foundStart && savedSel.start >= charIndex && savedSel.start <= nextCharIndex) {
                range.setStart(node, savedSel.start - charIndex);
                foundStart = true;
            }
            if (foundStart && savedSel.end >= charIndex && savedSel.end <= nextCharIndex) {
                range.setEnd(node, savedSel.end - charIndex);
                throw stop;
            }
            charIndex = nextCharIndex;
        } else {
            for (var i = 0, len = node.childNodes.length; i < len; ++i) {
                traverseTextNodes(node.childNodes[i]);
            }
        }
    }

    try {
        traverseTextNodes(containerEl);
    } catch (ex) {
        if (ex == stop) {
            rangy.getSelection().setSingleRange(range);
        } else {
            throw ex;
        }
    }
}

function formatText() {
    var el = document.getElementById('pad');
    var savedSel = saveSelection(el);
    el.innerHTML = el.innerHTML.replace(/(<([^>]+)>)/ig,"");
    el.innerHTML = el.innerHTML.replace(/([0-9])/ig,"<font color='red'>$1</font>");

    // Restore the original selection
    restoreSelection(el, savedSel);
}

我要感谢 Tim 在这里与我们分享的功能，这对我正在从事的项目非常重要。我将他的功能嵌入了一个小的 jQuery 插件，可以在这里访问：https : //jsfiddle.net/sh5tboL8/

$.fn.get_selection_start = function(){
    var result = this.get(0).selectionStart;
    if (typeof(result) == 'undefined') result = this.get_selection_range().selection_start;
    return result;
}

$.fn.get_selection_end = function(){
    var result = this.get(0).selectionEnd;
    if (typeof(result) == 'undefined') result = this.get_selection_range().selection_end;
    return result;
}

$.fn_get_selected_text = function(){
    var value = this.get(0).value;
    if (typeof(value) == 'undefined'){
        var result = this.get_selection_range().selected_text;
    }else{
        var result = value.substring(this.selectionStart, this.selectionEnd);
    }
    return result;
}

$.fn.get_selection_range = function(){

    var range = window.getSelection().getRangeAt(0);
    var cloned_range = range.cloneRange();
    cloned_range.selectNodeContents(this.get(0));
    cloned_range.setEnd(range.startContainer, range.startOffset);
    var selection_start = cloned_range.toString().length;
    var selected_text = range.toString();
    var selection_end = selection_start + selected_text.length;
    var result = {
        selection_start: selection_start,
        selection_end: selection_end,
        selected_text: selected_text
    }
    return result;
}

$.fn.set_selection = function(selection_start, selection_end){
    var target_element = this.get(0);
    selection_start = selection_start || 0;
    if (typeof(target_element.selectionStart) == 'undefined'){
        if (typeof(selection_end) == 'undefined') selection_end = target_element.innerHTML.length;

        var character_index = 0;
        var range = document.createRange();
        range.setStart(target_element, 0);
        range.collapse(true);
        var node_stack = [target_element];
        var node = null;
        var start_found = false;
        var stop = false;

        while (!stop && (node = node_stack.pop())) {
            if (node.nodeType == 3){
                var next_character_index = character_index + node.length;
                if (!start_found && selection_start >= character_index && selection_start <= next_character_index){
                    range.setStart(node, selection_start - character_index);
                    start_found = true;
                }

                if (start_found && selection_end >= character_index && selection_end <= next_character_index){
                    range.setEnd(node, selection_end - character_index);
                    stop = true;
                }
                character_index = next_character_index;
            }else{
                var child_counter = node.childNodes.length;
                while (child_counter --){
                    node_stack.push(node.childNodes[child_counter]);
                }
            }
        }

        var selection = window.getSelection();
        selection.removeAllRanges();
        selection.addRange(range);
    }else{
        if (typeof(selection_end) == 'undefined') selection_end = target_element.value.length;
        target_element.focus();
        target_element.selectionStart = selection_start;
        target_element.selectionEnd = selection_end;
    }
}

插件只做我需要它做的事情，获取选定的文本，并设置自定义文本选择。它也适用于文本框和 contentEditable div。