​x
 
<!DOCTYPE html>
<html>
<body>
​
<script id="w3school-1">
document.write("Hello W3School.org.cn !");
</script>
​
<p>点击按钮遍历文档中所有的 script 元素，并输出每个 script 元素的 id。</p>
​
<button onclick="myFunction()">点我</button>
​
<p id="demo"></p>
​
<script  id="w3school-2">
function myFunction() {
    var x = document.scripts;
    var txt = "";
    var i;
    for (i = 0; i < x.length; i++) {
        txt = txt +  x[i].id + "<br>";
    }
    document.getElementById("demo").innerHTML = txt;
}
</script>
​
</body>
</html>