以下功能将在所有主流浏览器中实现：
function placeCaretAtEnd(el) {
el.focus();
if (typeof window.getSelection != "undefined"
&& typeof document.createRange != "undefined") {
var range = document.createRange();
range.selectNodeContents(el);
range.collapse(false);
var sel = window.getSelection();
sel.removeAllRanges();
sel.addRange(range);
} else if (typeof document.body.createTextRange != "undefined") {
var textRange = document.body.createTextRange();
textRange.movetoElementText(el);
textRange.collapse(false);
textRange.select();
}
}
placeCaretAtEnd( document.querySelector('p') );
p{ padding:.5em; border:1px solid black; }
<p contentEditable>foo bar </p>
在开始时将插入符几乎相同：只需要更改传递给的调用中的布尔值即可collapse()。这是一个示例，该示例创建用于将插入号放在开头和结尾的函数：
function createCaretPlacer(atStart) {
return function(el) {
el.focus();
if (typeof window.getSelection != "undefined"
&& typeof document.createRange != "undefined") {
var range = document.createRange();
range.selectNodeContents(el);
range.collapse(atStart);
var sel = window.getSelection();
sel.removeAllRanges();
sel.addRange(range);
} else if (typeof document.body.createTextRange != "undefined") {
var textRange = document.body.createTextRange();
textRange.movetoElementText(el);
textRange.collapse(atStart);
textRange.select();
}
};
}
var placeCaretAtStart = createCaretPlacer(true);
var placeCaretAtEnd = createCaretPlacer(false);
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