<!DOCTYPE html>
<html>
<head>
<script src="https://libs.baidu.com/jquery/2.1.4/jquery.min.js"></script>
<script>
$(document).ready(function(){ $("#btn1").click(function(){ $("#test1").text("Hello world!"); });
$("#btn2").click(function(){ $("#test2").html("<b>Hello world!</b>"); });
$("#btn3").click(function(){ $("#test3").val("Dolly Duck"); });
});
</script>
</head>
<body>
<p id="test1">This is a paragraph.</p>
<p id="test2">This is another paragraph.</p>
<p>Input field: <input type="text" id="test3" value="Mickey Mouse"></p>
<button id="btn1">Set Text</button>
<button id="btn2">Set HTML</button>
<button id="btn3">Set Value</button>
</body>
</html>