1. Use onload:
in body
<body onload="myfunction()">
2. Use window.onload:
in the script
<script type="text/javascript">
function myfun()
{
alert("this window.onload");
}
/*用window.onload调用myfun()*/
window.onload=myfun;//不要括号
</script>The following example changes the background color of id_1 after the page has finished loading.
<script language="javascript" >
function myfun() {
document.getElementById("id_1").style.background= "#000"; // 改变背景颜色
}
// 用js实现在加载完成一个页面后自动执行一个方法
/*用window.onload调用myfun()*/
window.onload=myfun;//不要括号
</script>
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
