​x
 
<!DOCTYPE html>
<html>
<body>
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<h1 style="color: red; font-size: 50px;">遍历所有样式属性</h1>
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<p>点击按钮可显示 H1 元素的所有样式属性：</p>
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<button onclick="myFunction()">试一试</button>
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<p id="demo"></p>
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<script>
function myFunction() {
  var elmnt, i, txt = "";
  elmnt = document.getElementsByTagName("h1")[0];
  for (i = 0; i < elmnt.style.length; i++) {
    txt += elmnt.style.item(i) + "<br>";
  }
  document.getElementById("demo").innerHTML += txt;
}
</script>
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</body>
</html>
​