String_JavaScript

桃扇骨 2024-03-31 12:58 23阅读 0赞

## String\_JavaScript ##

**学习路线**：[JavaScript基础语法（输出语句）][JavaScript]\->[JavaScript基础语法（变量）][JavaScript 1]\->[JavaScript基础语法（数据类型）][JavaScript 2]\->[JavaScript基础语法（运算符）][JavaScript 3]\->[JavaScript基础语法（流程控制语句）][JavaScript 4]\->[JavaScript基础语法（类型转换）][JavaScript 5]\->[JavaScript基础语法（函数）][JavaScript 6]\->[Array\_JavaScript][Array_JavaScript]\->[String\_JavaScript][String_JavaScript]\->[自定义对象\_JavaScript][JavaScript 7]\->[JavaScript\_BOM][JavaScript_BOM]\->[Window对象][Window]\->[confirm()、setInterval()、setTimeout()][confirm_setInterval_setTimeout]\->[History、Location][History_Location]\->[闪烁的灯泡][Link 1]\->[JavaScript\_DOM][JavaScript_DOM]\->[事件绑定(onclick,onfocus,onblur)][onclick_onfocus_onblur]\->  
[事件绑定(onmouseout,onmouseover)  
][onmouseout_onmouseover_]\->[事件绑定(onsubmit)表单提交  
][onsubmit_]\->[提交表单与验证表单案例  
][Link 2]

**简介**：String对象。  
[官方文档][Link 3]  
创建方式

*  方式1：
    
        var 变量名 = new String(s);
 *  方式2：
    
        var 变量名 = "数组";

**属性：**

String对象提供了很多属性，属性 `length`特别常用 ，该属性是用于动态的获取字符串的长度

![在这里插入图片描述][3039e94f863a49cda1fbbf1579cebe4a.png]

**函数：**

String常用的函数

![在这里插入图片描述][28a9d3dfec4f4706a6c7a2225aa50f6c.png]

**遍历方法**

<!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
    </head>
    <body>
        
    <script>
        var str = "abc"
        for(var i = 0; i < str.length; ++ i){
        
            console.log(str.charAt(i))
        }
    </script>
    </body>
    </html>

**`tirm()`:去掉两边空格**

代码演示：

<!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
    </head>
    <body>
        
    <script>
        var str4 = '  abc   ';    
        alert(str4.trim());
    </script>
    </body>
    </html>

**运行结果**  
![在这里插入图片描述][777e63b098094c80b5bbc87d0056ac43.png]

`trim()` 函数在以后开发中还是比较常用的，例如登录页面  
![在这里插入图片描述][7192d82a101745ac8ea4e38ac2db50fc.png]

[JavaScript]: https://blog.csdn.net/qq_51447496/article/details/128085137
[JavaScript 1]: https://blog.csdn.net/qq_51447496/article/details/128085348
[JavaScript 2]: https://blog.csdn.net/qq_51447496/article/details/128086148
[JavaScript 3]: https://blog.csdn.net/qq_51447496/article/details/128086681
[JavaScript 4]: https://blog.csdn.net/qq_51447496/article/details/128088817
[JavaScript 5]: https://blog.csdn.net/qq_51447496/article/details/128087248
[JavaScript 6]: https://blog.csdn.net/qq_51447496/article/details/128088986
[Array_JavaScript]: https://blog.csdn.net/qq_51447496/article/details/128089474
[String_JavaScript]: https://blog.csdn.net/qq_51447496/article/details/128089631
[JavaScript 7]: https://blog.csdn.net/qq_51447496/article/details/128089766
[JavaScript_BOM]: https://editor.csdn.net/md/?articleId=128095193
[Window]: https://blog.csdn.net/qq_51447496/article/details/128095300
[confirm_setInterval_setTimeout]: https://blog.csdn.net/qq_51447496/article/details/128103458
[History_Location]: https://blog.csdn.net/qq_51447496/article/details/128104240
[Link 1]: https://blog.csdn.net/qq_51447496/article/details/128095524
[JavaScript_DOM]: https://blog.csdn.net/qq_51447496/article/details/128104720
[onclick_onfocus_onblur]: https://blog.csdn.net/qq_51447496/article/details/128110532
[onmouseout_onmouseover_]: https://blog.csdn.net/qq_51447496/article/details/128112439
[onsubmit_]: https://blog.csdn.net/qq_51447496/article/details/128112553
[Link 2]: https://blog.csdn.net/qq_51447496/article/details/128112770
[Link 3]: https://www.w3school.com.cn/jsref/jsref_obj_string.asp
[3039e94f863a49cda1fbbf1579cebe4a.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/31/c9550feec68c4851b80b0ac2afc87f4b.png
[28a9d3dfec4f4706a6c7a2225aa50f6c.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/31/8a3268c8683f491a88439748f30272b8.png
[777e63b098094c80b5bbc87d0056ac43.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/31/f594010aeefc46ba9bbfc9d3064fbe51.png
[7192d82a101745ac8ea4e38ac2db50fc.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/31/343a88a4f8034043a1f5a4be063bdcb8.png

String_JavaScript

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