onclick的一些小問(wèn)題
如果從文本框里面接收參數(shù) 再通過(guò)onclick調(diào)用add3（）該怎么寫？?????
qq_慕先生0585124
2019-11-11
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2019-11-11
<body>???? <form?id="root"> ????<input?type="text"?id="num1"?placeholder="第一個(gè)數(shù)">???????? ????<input?type="text"?id="num2"?placeholder="第二個(gè)數(shù)">???????? ????<input?type="text"?id="num3"?placeholder="第三個(gè)數(shù)">???????? ????<input?type="submit"?value="求和">????? </form>???? <p?id="result"></p> </body> <script?type="text/javascript">???? document.getElementById("root").addEventListener("submit",add3);?//綁定事件，調(diào)用方法???? function?add3(e){???????? ????e.preventDefault();?//阻止默認(rèn)事件???????? ????var?num1?=?parseInt(document.getElementById("num1").value);?//獲取表單值，轉(zhuǎn)為數(shù)值類型???????? ????var?num2?=?parseInt(document.getElementById("num2").value);???????? ????var?num3?=?parseInt(document.getElementById("num3").value);???????? ????var?sum?=?0;???????? ????sum?=?num1?+?num2?+num3;???????? ????document.getElementById("result").innerHTML?=?"結(jié)果為："+sum;???? } </script>2020-03-06
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>返回值函數(shù)</title>
<script type="text/javascript">
? function? app2(x,y)
? { var sum,x,y;
? ? sum = x * y;
? ? return sum;
? }
? function getvalue()
? {
? ?// alert("1111");
? ?//獲取文本框中輸入的值
? ? var nu1 = document.getElementById("num1").value;
? ? var nu2 = document.getElementById("num2").value;
? ? req1 = app2(nu1,nu2);
? ? document.write(req1);
? }
</script>
</head>
<body>
? ? <input type="text" id='num1' /><br/>
? ? <input type="text" id='num2'/><br/>
? ? <input type="button" value="點(diǎn)擊提交" onclick="getvalue()">
</body>
</html>