Edit in JSFiddle

$(function () {
    $("#div1").html("<a href='http://blog.developer.idv.tw'><b>Xian's blog</b></a>");
    $("#div2").text("<a href='http://blog.developer.idv.tw'><b>Xian's blog</b></a>");
    $("#div3").replaceWith("<p>div3 replace with Paragraph</p>");
    $("<p>Paragraph replace all div4</p>").replaceAll("#div4");
});

<div id="div1"></div>
<div id="div2"></div>
<div id="div3"></div>
<div id="div4"></div>