向页面写入一句话

helloworld!

document.write("hello world!");

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function insertParagraph(text){ var str = "<p>"; str += text; str += "</p>"; document.write(str);}

insertParagraph("hello world!");

?innerHTML方法

window.onload = function(){var testdiv = document.getElementById("testdiv");alert(testdiv.innerHTML);testdiv.innerHTML = "<p>hello word!</p>";}

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appendChild(),createTextNode()方法写

window.onload=function(){ var para = document.createElement("p"); var testdiv = document.getElementById("testdiv"); testdiv.appendChild(para); var txt = document.createTextNode("Hello wordl!"); para.appendChild(txt);}

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更复杂一些的<p>This is <em>my</em> content.</p>

var para = document.createElement("p");var txt1 = document.createTextNode("This is ");var emphasis = document.createElement("em");var txt2 = document.createTextNode("my");var txt3 = document.createTextNode(" content.");para.appendChild(txt1);emphasis.appendChild(txt2);para.appendChild(emphasis);para.appendChild(txt3);var testdiv = document.getElementById("testdiv");var testspan = document.getElementById("sp");

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<div id="testdiv"><span id="sp">ss</span></div>