js中字符串转number

490 阅读1分钟
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        var num = '150.5'
        console.log(typeof num)
        var  num1 = (num*1)
        var  num2 = (num*2)
        console.log('num1:',num1)
        console.log('乘以2变为数字类型 num2:',num2)
         console.log(typeof num2)
    </script>
</body>
</html>