HTML
<input id="ti" type="text" placeholder="请输入内容"><button onclick="show()">点击获取输入框的内容</button>js
function show(){
var b=document.getElementById('ti').value
console.log(b)
}测试
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>测试</title>
</head>
<body>
<input id="ti" type="text" placeholder="请输入内容"><button onclick="show()">点击获取输入框的内容</button>
<script>
function show(){
var b=document.getElementById('ti').value
console.log(b)
}
</script>
</body>
</html>