1.任意—number

    Number
    parseInt()
    parseFloat()

    1. <!DOCTYPE html>
    2. <html lang="en">
    3. <head>
    4.     <meta charset="UTF-8">
    5.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
    6.     <title>Document</title>
    7. </head>
    8. <body>
    9.     <!-- 1.任意--number -->
    10.     <script>
    11.         // Number
    12.         // parseInt()
    13.         // parseFloat()
    14.         var str = "12.12121px";
    15.         console.log(parseInt(str));
    16.         console.log(parseFloat(str));
    17.     </script>
    18. </body>
    19. </html>