重点
function go() {
var url = document.getElementById(“url”).value;
document.getElementById(“iframe1”).src = url;
}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script>
function go() {
var url = document.getElementById("url").value;
document.getElementById("iframe1").src = url;
}
</script>
</head>
<body>
<div>
<p>请输入地址</p>
<p>
<input type="text" id="url" value="">
<input type="submit" value="提交" οnclick="go()">
</p>
</div>
<div>
<iframe id="iframe1"style="width: 100%" height="400px" frameborder="1"></iframe>
</div>
</body>
</html>