​x
 
<!DOCTYPE html>
<html>
​
<body style="background-image:url('/i/pic/tree.png');background-repeat:no-repeat;">
​
<h1>HTML Style 对象</h1>
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<h2>backgroundPosition 属性</h2>
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<button type="button" onclick="myFunction()">定位背景图像</button>
​
<script>
function myFunction() {
  document.body.style.backgroundPosition="top right"; 
}
</script>
​
</body>
</html>
​