问文本区域中的光标位置(字符索引，而不是x/y坐标)

EN

var position = window.getSelection().getRangeAt(0).startOffset;

(function ($, undefined) {
    $.fn.getCursorPosition = function() {
        var el = $(this).get(0);
        var pos = 0;
        if('selectionStart' in el) {
            pos = el.selectionStart;
        } else if('selection' in document) {
            el.focus();
            var Sel = document.selection.createRange();
            var SelLength = document.selection.createRange().text.length;
            Sel.moveStart('character', -el.value.length);
            pos = Sel.text.length - SelLength;
        }
        return pos;
    }
})(jQuery);

$("#myTextBoxSelector").getCursorPosition();

function caretPos(el)
{
    var pos = 0;
    // IE Support
    if (document.selection) 
    {
        el.focus ();
        var Sel = document.selection.createRange();
        var SelLength = document.selection.createRange().text.length;
        Sel.moveStart ('character', -el.value.length);
        pos = Sel.text.length - SelLength;
    }
    // Firefox support
    else if (el.selectionStart || el.selectionStart == '0')
        pos = el.selectionStart;

    return pos;

}