zoukankan      html  css  js  c++  java
  • js数据强转

    <!DOCTYPE html>
    <html>
        <head>
            <meta charset="utf-8">
            <title></title>
            <script type="text/javascript">
                /* 强转 */
                /* 1.其他类型转为Number类型 */
                var s1 = "10";
                var s2 = "abc";
                var b1 = false;
                var o1 = Object(10);
                var o2 = new Array();
                o2[0]=1;
                o2[1]=2;
                var o3 = null;
                document.write("String转number,可转:"+Number(s1)+"<br>");//10
                document.write("String转number,不可转:"+Number(s2)+"<br>");//Nan
                document.write("boolean转number,可转:"+Number(b1)+"<br>");//0
                document.write("Object转number=:"+Number(o2)+"<br>");//若o2中只有o2[0],则为1,若还有o2[1],则为NaN
                document.write("null转number:"+Number(o3)+"<br>");//0
                /* 能转就转,不能转就为NaN, */
                /* 2.其他类型转为boolean类型 */
                var nb = 10;
                var sb = "abc";
                var ob = new Object(1);
                var unb;
                //2.1Number转Boolean
                document.write("Number转Boolean:"+Boolean(nb)+"<br>");//非零转成true,0转成false
                //2.2String转Boolean
                document.write("String转Boolean:"+Boolean(sb)+"<br>");//非空转成true,空转成false
                //2.3Object转Boolean
                document.write("Object转Boolean:"+Boolean(ob)+"<br>");//非null转成true,null转成false
                //2.4声明未赋值(undefined)转Boolean
                document.write("声明未赋值(undefined)转Boolean:"+Boolean(unb)+"<br>");//false
    </script> </head> <body> </body> </html>
    <!DOCTYPE html>
    <html>
        <head>
            <meta charset="utf-8">
            <title></title>
            <script type="text/javascript">
                /* 3.boolean转String */
                var b = true;
                document.write("Boolean转String:"+typeof(b.toString())+"<br>");//String
                /* 4.String转Number */
                var s = "10";
                document.write("String转Number:"+typeof(parseInt(s) )+"<br>");//number
            </script>
        </head>
        <body>
        </body>
    </html>
  • 相关阅读:
    Jmeter关联-获取token值
    Jmeter接口测试
    Jmeter关联,正则表达式提取器使用2
    Jmeter关联,正则表达式提取器使用1
    Jmeter-CSV Data Set Config参数化
    Fiddler基本用法:手机抓包1
    接口测试该怎样入手?
    Fiddler简介与Web抓包,远程抓包(IE、360、谷歌、火狐)
    PHP 插件资源
    利用PHP递归 获取所有的上级栏目
  • 原文地址:https://www.cnblogs.com/qilin20/p/12599116.html
Copyright © 2011-2022 走看看