Javascript 如何获取用户输入和输出值?
嗨,我想得到用户写的东西,乘以一些数字,然后在标题中显示结果Javascript 如何获取用户输入和输出值?,javascript,Javascript,嗨,我想得到用户写的东西,乘以一些数字,然后在标题中显示结果 <!DOCTYPE html> <html lang="en" dir="ltr"> <head> <meta charset="utf-8"> <title></title> </head> <body> <input type="text" id="number" name="num"
<!DOCTYPE html>
<html lang="en" dir="ltr">
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<input type="text" id="number" name="num" value="">
<div id = "output">
<h2 id="OP"></h2>
</div>
</body>
</html>
var valResult = parseInt(document.getElementById("number").value);
var num = 5;
var results = valResult + num;
if (valResult == 10){
document.getElementById("OP").innerHTML = results;
}
var valResult=parseInt(document.getElementById(“number”).value);
var-num=5;
var results=valResult+num;
如果(valResult==10){
document.getElementById(“OP”).innerHTML=结果;
}
您有一些不必要的代码。你真的需要:
if (valResult == 10){....
请尝试以下操作:
函数计算(输入){
var valResult=parseInt(input.value);
var-num=5;
var results=valResult*num;
document.getElementById(“OP”).innerHTML=结果;
}