突出显示与选择文字不同(是的,你的标题是好的！)

这应该有助于：

Working demo

function selectText(element) {
    var doc = document;
    var text = doc.getElementById(element);    

    if (doc.body.createTextRange) { // ms
        var range = doc.body.createTextRange();
        range.moveToElementText(text);
        range.select();
    } else if (window.getSelection) { // moz,opera,webkit
        var selection = window.getSelection();            
        var range = doc.createRange();
        range.selectNodeContents(text);
        selection.removeAllRanges();
        selection.addRange(range);
    }
}

selectText('foo');

刚刚发现原作者为我长久保存的sniplr片段,得分：@Jason线程here.