0

这是我的代码:

<script type="text/javascript" language="javascript">
function calc(){
    var a = prompt("Enter a number");
    var b = prompt("Enter another number");
    var x = +a;
    var y = +b;
    alert("The answer is " + (x+y));
}
function rect(type){
    var a = prompt("Enter length of rectangle");
    var b = prompt("Enter width of rectangle");
    var x = +a;
    var b = +b;
    if(type=="area"){
        alert("The area is " + (x*y);
    }
    else if(type=="perimeter"){
        alert("The perimeter is " + ( (2*x)+(2*y) );
    }
}
</script>

<head>
    <title>JavaScript Calculator</title>
</head>

<body>
    <button onclick="calc()">Calculator</button>
    <button onclick="rect('area')">Area of Rectangle</button>
    <button onclick="rect('perimeter')">Perimeter of Rectangle</button>
</body>

当我注释掉 rect 函数时,我的代码运行良好,只是计算器按钮是唯一有效的按钮。其他两个按钮应该可以正常使用 rect 函数,但它们不是,当我取消注释 rect 函数时,Calculator 按钮也停止工作。为什么是这样?

4

1 回答 1

5

你缺少一些括号

alert("The area is " + (x*y));
// and:
alert("The perimeter is " + ( (2*x)+(2*y) ));
于 2012-12-26T20:12:34.557 回答