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<html>3
<body>4
<head>5
<meta name="description" content="编程技术入门教程">6
<meta name="keywords" content="HTML5,CSS,JavaScript">7
<meta name="author" content="mifengjc">8
</head>9
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<p>点击按钮返回所有 meta 元素的name属性的值。</p>11
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<button onclick="myFunction()">点我</button>13
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<p id="demo"></p>15
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<script>17
function myFunction() {18
var x = document.getElementsByTagName("META");19
var txt = "";20
var i;21
for (i = 0; i < x.length; i++) {22
txt = txt + "第 " + (i + 1) + " 个 meta 标签 name 属性值 : " + x[i].name + "<br>";23
}24
document.getElementById("demo").innerHTML = txt;25
}26
</script>27
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</body>29
</html>