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<h1 id="myH1" style="color:red">我的标题</h1>
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<p>点击按钮获取 H1 元素的 style 属性。</p>
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<p id="demo"></p>
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<button onclick="myFunction()">尝试一下</button>
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<script>
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function myFunction() {
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var x = document.getElementById("myH1").style.color;
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document.getElementById("demo").innerHTML = x;
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};
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</script>