求助求助？怎么实现换行插入

源自：9-16 创建元素节点createElement

<!DOCTYPE HTML>

<html>

<head>

<title>无标题文档</title>

</head>

<body>

var main = document.body;

//创建链接

function createa(url,text)

{var a=document.createElement("a");

a.href=url;

a.innerHTML=text;

a.style.color="red";

main.appendChild(a);

}

// 调用函数创建链接

createa("http://www.imooc.com/","慕课网");

var br=document.createElement("br");

var body=document.getElementsByTagName("body");

body.insertBefore(br,body.childNodes[0]);

createa("http://www.xiaokanba.com","小看吧");

</script>

</body>

</html>

提问者：日久弥新 2018-01-26 16:28