代码示例:(标识:jsck_style_paddingleft_1)
<!DOCTYPE html>
<html>
<head>
<style>
#myDiv {
  border: 1px solid #FF0000;
}
</style>
</head>
<body>

<div id="myDiv">这是 div。</div>
<br>
<button type="button" onclick="myFunction()">设置左内边距</button>

<script>
function myFunction() {
  document.getElementById("myDiv").style.paddingLeft = "50px";
}
</script>

</body>
</html>
运行结果: