[py]js前端求和与flask后端求和

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index.html

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Counter</title>

</head>

<body>

<div>

    <input id="i1" type="text" name="n1"/>

    +

    <input id="i2" type="text" name="n2"/>

    =

    <input id="i3" type="text" name="n3"/>

    <input type="button" value="原生Ajax" onclick="get_sum()">

</div>

<script>

    var i1 = document.getElementById("i1");// 获取三个input

    var i2 = document.getElementById("i2");

    var i3 = document.getElementById("i3");

    function get_sum() {

        var n1 = i1.value; // 获取input里的value

        var n2 = i2.value;

        i3.value = parseInt(n1)+parseInt(n2); //str转int

    }

</script>

</body>

</html>