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读取<a href="dom_obj_attributes.php" target="_blank">Attr 对象</a>.
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<p id="demo">单击按钮以显示上述链接的目标属性的值</p>
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<button onclick="myFunction()">点我</button>
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<script>
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function myFunction() {
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var a = document.getElementsByTagName("a")[0];
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var x = document.getElementById("demo");
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x.innerHTML = a.getAttributeNode("target").value;
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}
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</script>