​x
 
<!DOCTYPE html>
<html>
<body>
​
<h1 style="color: red; font-size:50px;">cssText 属性</h1>
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<p>单击按钮可返回元素的行内样式声明的值。</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 = document.getElementsByTagName("h1")[0];
  var x = elmnt.style.cssText;
  document.getElementById("demo").innerHTML = x;
}
</script>
​
</body>
</html>
​