【JS】加减乘除函数
个人思路，仅供参考
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>d24c04429</title>
<meta name="viewport"
content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
</head>
<body>
<script>
function getSum(a, b) {
var sum = parseInt(a)+parseInt(b);
return sum;
}
function getSub(a, b) {
var sub = parseInt(a)-parseInt(b);
return sub;
}
function getMul(a, b) {
var mul = parseInt(a)*parseInt(b);
return mul;
}
function getDiv(a, b) {
var div = parseInt(a)/parseInt(b);
return div;
}
var a = prompt("请输入第一个数字：");
var tip = prompt("+加法 -减法 *乘法 /除法 请输入符号：");
var b = prompt("请输入第二个数字：");
if (tip == "+") {
alert("结果是：" + getSum(a, b));
} else if (tip == "-") {
alert("结果是：" + getSub(a, b));
} else if (tip == "*") {
alert("结果是：" + getMul(a, b));
} else if (tip == "/") {
alert("结果是：" + getDiv(a, b));
} else {
alert("输入错误！");
}
</script>
</body>
</html>
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