javaweb/javascript/js_global/js_global.html at master · CPU-Code/javaweb · GitHub

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<!--
 * @由于个人水平有限, 难免有些错误, 还请指点:
 * @Author: cpu_code
 * @Date: 2020-10-18 11:42:57
 * @LastEditTime: 2020-10-18 12:56:23
 * @FilePath: \web\javascript\js_global\js_global.html
 * @Gitee: [https://gitee.com/cpu_code](https://gitee.com/cpu_code)
 * @Github: [https://github.com/CPU-Code](https://github.com/CPU-Code)
 * @CSDN: [https://blog.csdn.net/qq_44226094](https://blog.csdn.net/qq_44226094)
 * @Gitbook: [https://923992029.gitbook.io/cpucode/](https://923992029.gitbook.io/cpucode/)
-->
<!DOCTYPE html>
<html lang="ch">
    <head>
        <meta charset="UTF-8">
        <title>gloabal对象</title>
        <script>
            /*
            Global
                1. 特点：全局对象，这个Global中封装的方法不需要对象就可以直接调用。  方法名();
            */

            var str = "https://github.com/CPU-Code/呵呵";

            // encodeURI():url编码
            var encode = encodeURI(str);

            document.write(encode + "<br>");
            // decodeURI():url解码
            var s = decodeURI(encode);
            document.write(s + "<br>");

            var str1 = "https://github.com/CPU-Code/呵呵";
            //encodeURIComponent():url编码,编码的字符更多
            var encode1 = encodeURIComponent(str1);
            document.write(encode1 + "<br>");

            //decodeURIComponent():url解码
            var s1 = decodeURIComponent(encode1);
            document.write(s1 + "<br>");

            var str = "11";
            // parseInt():将字符串转为数字
            // 逐一判断每一个字符是否是数字，直到不是数字为止，将前边数字部分转为number
            var number = parseInt(str);
            number += 1;
            document.write(number + "<br>");

            var a = NaN;

            document.write("a == NaN =" + a == NaN );
            document.write("<br>");
            // isNaN():判断一个值是否是NaN
            // NaN六亲不认，连自己都不认。NaN参与的==比较全部问false
            document.write("isNaN(a) = " + isNaN(a) + "<br>");

            var jscode = "alert(cpucode);";
            // eval():讲 JavaScript 字符串，并把它作为脚本代码来执行
            eval(jscode);
        </script>
    </head>

    <body>

    </body>
</html>