<html xmlns="http://www.w3.org/1999/xhtml"> <head> </head> <body> <script> function myFunction() { var btn1 = document.getElementById("btn1"); alert(btn1.innerText); //我是按钮 alert(btn1.innerHTML); //我是按钮 alert(btn1.value); //空，按钮不能用Value! btn1.value = "value"; //按钮不可以这样改变值 btn1.innerText = "innerText"; //按钮可以用innerText改变值 btn1.innerHTML = "innertHTML"; //按钮也可以用 innerHTML改变值 var input1 = document.getElementById("input1"); alert(input1.value); //可以获取值 alert(input1.innerText); //没有值 alert(input1.innerHTML); //没有值 input1.value = 5; //可以改变值 input1.innerText = 6; //不可以改变值 input1.innerHTML = 7; //不可以改变值 var html2 = document.getElementById("test"); alert(test.innerHTML); // <span style="color:red">test1</span> test2 alert(test.innerText); //test1 test2 alert(test.outerHTML); //结果如下： //<div id="test"> // <span style="color:red">test1</span> test2 //</div> } </script> <input id="input1" type="text" /> <button id="btn1" type="button" onclick="myFunction()"> 我是按钮</button> <p id="mess"> </p> <div id="test"> <span style="color: red">test1</span> test2 </div> </body> </html>