contenteditable：保存和恢复插入位置

Question

以下功能会使插入符号移回到开头。在调用函数后，如何使它保持在同一位置？

function highlightText() {
            var mystring = document.getElementById("writeArea").textContent;
            mystring = mystring.replace(/function/g , "<span class=\"func\">function</span>");
            document.getElementById("writeArea").innerHTML = mystring;
        }

可信的声明：

<div class="codeArea" id="writeArea" contenteditable="true"> <p> edit me! </p> </div>

Answer 1

使用selectionStart来获取和设置插入符号的位置：

＆＃13;

＆＃13;

document.getElementById("writeArea").onkeyup = highlightText(this);
function highlightText(o) {
  var mystring = document.getElementById("writeArea").textContent,
  caretPosition = o.selectionStart;
  mystring = mystring.replace(/function/g , "<span class=\"func\">function</span>");
  document.getElementById("writeArea").innerHTML = mystring;
  document.getElementById("writeArea").selectionStart = caretPosition;
}

＆＃13;

<div class="codeArea" id="writeArea" contenteditable="true"> <p> edit me! </p> </div>

＆＃13;

＆＃13;

＆＃13;