以下代码假定：
- 可编辑内容中始终只有一个文本节点
<div>
，没有其他节点 - 可编辑的div没有将CSS
white-space
属性设置为pre
码：
function getCaretPosition(editableDiv) { var caretPos = 0, sel, range; if (window.getSelection) { sel = window.getSelection(); if (sel.rangeCount) { range = sel.getRangeAt(0); if (range.commonAncestorContainer.parentNode == editableDiv) { caretPos = range.endOffset; } } } else if (document.selection && document.selection.createRange) { range = document.selection.createRange(); if (range.parentElement() == editableDiv) { var tempEl = document.createElement("span"); editableDiv.insertBefore(tempEl, editableDiv.firstChild); var tempRange = range.duplicate(); tempRange.moveToElementText(tempEl); tempRange.setEndPoint("EndToEnd", range); caretPos = tempRange.text.length; } } return caretPos;}#caretposition { font-weight: bold;}<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script><div id="contentbox" contenteditable="true">Click me and move cursor with keys or mouse</div><div id="caretposition">0</div><script> var update = function() { $('#caretposition').html(getCaretPosition(this)); }; $('#contentbox').on("mousedown mouseup keydown keyup", update);</script>
