我试图用JavaScript创建一个非常基本的富文本编辑器，但我在选择方面遇到了问题。所以基本上，因为它是一个可编辑的

一个容易破解的方法是将焦点放在

所以这很简单，但是当我把注意力放回可编辑的内容时

// Helpers to keep track of the length of the thing we paste, the cursor position
// and a temporary random number so we can mark the position.
editor_stuff = 
{
    cursor_position: 0,
    paste_length: 0,
    temp_rand: 0,
}

// On key up (for the textarea).
document.getElementById("backup_editor").onkeyup = function() 
{ 
    var main_editor     =  document.getElementById("question_editor");
    var backup_editor   =  document.getElementById("backup_editor");
    var marker_position = main_editor.innerHTML.search(editor_stuff.temp_rand);

    // Replace the "marker" with the .value of the <textarea>
    main_editor.innerHTML = main_editor.innerHTML.replace(editor_stuff.temp_rand, backup_editor.value);

    backup_editor.value = "";

    main_editor.focus();
}

// On key down (for the contentEditable DIV).
document.getElementById("question_editor").onkeydown = function(event)
{
    key = event;

    // Grab control + V end handle paste so "plain text" is pasted and
    // not formatted text. This is easy to break with Edit -> Paste or
    // Right click -> Paste.

    if
    (
        (key.keyCode == 86 || key.charCode == 86) &&                   // "V".
        (key.keyCode == 17 || key.charCode == 17 || key.ctrlKey)       // "Ctrl"
    )
    {
        // Create a random number marker at the place where we paste.
        editor_stuff.temp_rand = Math.floor((Math.random() * 99999999));

        document.getElementById("question_editor").textContent +=  editor_stuff.temp_rand;
        document.getElementById("backup_editor").focus();
    }
}

因此，我的想法是将光标位置（整数）存储在助手数组中（editor\u stuff.cursor\u position）。

N. B.我一整天都在看SO的其他答案，但没有一个能为我工作。