一点一滴学前端 - join()

叁歲伎倆 2023-02-10 03:39 18阅读 0赞

## 一. 简介 ##

**join()** 方法的作用是把一个**数组**通过**分隔符**拼接成一个字符串

如：  
strs = \[“a”, “b”, “c”, “d”\];  
使用result = strs.join(’-’);  
可转变成 result = a-b-c-d

## 二. 语法格式 ##

# 通用格式
    Array.join(separator)
    
    # 特殊
    Array.join() = Array.join(',')

## 三. 示例 ##

<html>
        <head>
            <title>test join</title>
        </head>
    
        <body>
            <p id="target">生成结果区域</p>
            <button onclick="test()">转换join()</button>
            <button onclick="test('-')">转换join('-')</button>
            <button onclick="test(',')">转换join(',')</button>
            <button onclick="test('\r')">转换join('\r')</button>
            <button onclick="test('\n')">转换join('\n')</button>
    
            <script>
            function test(separator){ 
                var strs = ["a", "b", "c", "d"];
                var target = document.getElementById("target");
                target.innerHTML = strs.join(separator);
            }
            </script>
        </body>
    </html>

**运行结果：**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzk2ODIzNA_size_16_color_FFFFFF_t_70]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzk2ODIzNA_size_16_color_FFFFFF_t_70 1]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzk2ODIzNA_size_16_color_FFFFFF_t_70 2]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzk2ODIzNA_size_16_color_FFFFFF_t_70 3]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzk2ODIzNA_size_16_color_FFFFFF_t_70 4]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzk2ODIzNA_size_16_color_FFFFFF_t_70 5]

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