是否有Internet Explorer批准的selectionStart和selectionEnd替代品？

我将再次发布此函数，以查看该问题是否与另一个问题相关联。

以下将在所有浏览器中完成工作，并处理所有新行问题，而不会严重影响性能。我经过一番折腾之后才来到这里，现在我很确信这是最好的功能。

更新

此函数确实假定textarea / input具有焦点，因此您可能需要在调用textarea的

focus()

function getInputSelection(el) {    var start = 0, end = 0, normalizedValue, range,        textInputRange, len, endRange;    if (typeof el.selectionStart == "number" && typeof el.selectionEnd == "number") {        start = el.selectionStart;        end = el.selectionEnd;    } else {        range = document.selection.createRange();        if (range && range.parentElement() == el) { len = el.value.length; normalizedValue = el.value.replace(/rn/g, "n"); // Create a working TextRange that lives only in the input textInputRange = el.createTextRange(); textInputRange.moveToBookmark(range.getBookmark()); // Check if the start and end of the selection are at the very end // of the input, since moveStart/moveEnd doesn't return what we want // in those cases endRange = el.createTextRange(); endRange.collapse(false); if (textInputRange.compareEndPoints("StartToEnd", endRange) > -1) {     start = end = len; } else {     start = -textInputRange.moveStart("character", -len);     start += normalizedValue.slice(0, start).split("n").length - 1;     if (textInputRange.compareEndPoints("EndToEnd", endRange) > -1) {         end = len;     } else {         end = -textInputRange.moveEnd("character", -len);         end += normalizedValue.slice(0, end).split("n").length - 1;     } }        }    }    return {        start: start,        end: end    };}var el = document.getElementById("your_input");el.focus();var sel = getInputSelection(el);alert(sel.start + ", " + sel.end);