JavaScript 字符串(String) 大全

妖狐艹你老母 2021-10-29 07:54 405阅读 0赞

#### JavaScript字符串存储一系列字符，如“John Doe”。字符串可以是双引号或单引号内的任何文本： ####

<!DOCTYPE html>
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 <meta charset="utf-8">
 <title></title>
 <body>
 
 <h2>JavaScript 字符串</h2>
 
 字符串写在引号内。 您可以使用单引号或双引号：
 
 
 
 <script>
 var carName1 = "Volvo XC60"; // 双引号 var carName2 = 'Volvo XC60'; // 单引号 document.getElementById("demo").innerHTML = carName1 + " " + carName2; </script> </body> </html>

# 字符串属性 #

# 字符串方法 #

<table> 
 <thead> 
 <tr> 
 <th>方法</th> 
 <th>描述</th> 
 </tr> 
 </thead> 
 <tbody> 
 <tr> 
 <td><a href="https://www.jc2182.com/javascript-string-charat-method/1952.html" rel="nofollow">charAt()</a></td> 
 <td>返回指定索引处的字符（位置）</td> 
 </tr> 
 <tr> 
 <td><a href="https://www.jc2182.com/javascript-string-charcodeat-method/1953.html" rel="nofollow">charCodeAt()</a></td> 
 <td>返回指定索引处的字符的Unicode</td> 
 </tr> 
 <tr> 
 <td><a href="https://www.jc2182.com/javascript-string-concat-method/1955.html" rel="nofollow">concat()</a></td> 
 <td>连接两个或多个字符串，并返回一个新的连接字符串</td> 
 </tr> 
 <tr> 
 <td><a href="https://www.jc2182.com/javascript-string-endswith-method/1956.html" rel="nofollow">endsWith()</a></td> 
 <td>检查字符串是否以指定的字符串/字符结尾</td> 
 </tr> 
 <tr> 
 <td><a href="https://www.jc2182.com/javascript-string-fromcharcode-method/1957.html" rel="nofollow">fromCharCode()</a></td> 
 <td>将Unicode值转换为字符</td> 
 </tr> 
 <tr> 
 <td><a href="https://www.jc2182.com/javascript-string-includes-method/1958.html" rel="nofollow">includes()</a></td> 
 <td>检查字符串是否包含指定的字符串/字符</td> 
 </tr> 
 <tr> 
 <td><a href="https://www.jc2182.com/javascript-string-indexof-method/1959.html" rel="nofollow">indexOf()</a></td> 
 <td>返回字符串中第一次找到的指定值的位置</td> 
 </tr> 
 <tr> 
 <td><a href="https://www.jc2182.com/javascript-string-lastindexof-method/1960.html" rel="nofollow">lastIndexOf()</a></td> 
 <td>返回字符串中最后一次找到的指定值的位置</td> 
 </tr> 
 <tr> 
 <td><a href="https://www.jc2182.com/javascript-string-localecompare-method/1961.html" rel="nofollow">localeCompare()</a></td> 
 <td>比较当前语言环境中的两个字符串</td> 
 </tr> 
 <tr> 
 <td><a href="https://www.jc2182.com/javascript-string-match-method/1962.html" rel="nofollow">match()</a></td> 
 <td>搜索字符串以查找与正则表达式匹配的内容，并返回匹配项</td> 
 </tr> 
 <tr> 
 <td><a href="https://www.jc2182.com/javascript-string-repeat-method/1963.html" rel="nofollow">repeat()</a></td> 
 <td>返回具有指定现有字符串副本数的新字符串</td> 
 </tr> 
 <tr> 
 <td><a href="https://www.jc2182.com/javascript-string-replace-method/1964.html" rel="nofollow">replace()</a></td> 
 <td>在字符串中搜索指定的值或正则表达式，并返回替换指定值的新字符串</td> 
 </tr> 
 <tr> 
 <td><a href="https://www.jc2182.com/javascript-string-search-method/1965.html" rel="nofollow">search()</a></td> 
 <td>在字符串中搜索指定值或正则表达式，并返回匹配的位置</td> 
 </tr> 
 <tr> 
 <td><a href="https://www.jc2182.com/javascript-string-slice-method/1966.html" rel="nofollow">slice()</a></td> 
 <td>提取字符串的一部分并返回一个新字符串</td> 
 </tr> 
 <tr> 
 <td><a href="https://www.jc2182.com/javascript-string-split-method/1967.html" rel="nofollow">split()</a></td> 
 <td>将字符串拆分为子字符串数组</td> 
 </tr> 
 <tr> 
 <td><a href="https://www.jc2182.com/javascript-string-startswith-method/1968.html" rel="nofollow">startsWith()</a></td> 
 <td>检查字符串是否以指定的字符开头</td> 
 </tr> 
 <tr> 
 <td><a href="https://www.jc2182.com/javascript-string-substr-method/1969.html" rel="nofollow">substr()</a></td> 
 <td>从字符串中提取字符，从指定的起始位置开始，然后通过指定的字符数</td> 
 </tr> 
 <tr> 
 <td><a href="https://www.jc2182.com/javascript-string-substring-method/1970.html" rel="nofollow">substring()</a></td> 
 <td>从两个指定索引之间的字符串中提取字符</td> 
 </tr> 
 <tr> 
 <td><a href="https://www.jc2182.com/javascript-string-tolocalelowercase-method/1971.html" rel="nofollow">toLocaleLowerCase()</a></td> 
 <td>根据主机的语言环境将字符串转换为小写字母</td> 
 </tr> 
 <tr> 
 <td><a href="https://www.jc2182.com/javascript-string-tolocaleuppercase-method/1973.html" rel="nofollow">toLocaleUpperCase()</a></td> 
 <td>根据主机的语言环境将字符串转换为大写字母</td> 
 </tr> 
 <tr> 
 <td><a href="https://www.jc2182.com/javascript-string-tolowercase-method/1974.html" rel="nofollow">toLowerCase()</a></td> 
 <td>将字符串转换为小写字母</td> 
 </tr> 
 <tr> 
 <td><a href="https://www.jc2182.com/javascript-string-tostring-method/1975.html" rel="nofollow">toString()</a></td> 
 <td>返回String对象的值</td> 
 </tr> 
 <tr> 
 <td><a href="https://www.jc2182.com/javascript-string-touppercase-method/1976.html" rel="nofollow">toUpperCase()</a></td> 
 <td>将字符串转换为大写字母</td> 
 </tr> 
 <tr> 
 <td><a href="https://www.jc2182.com/javascript-string-trim-method/1977.html" rel="nofollow">trim()</a></td> 
 <td>从字符串的两端删除空格</td> 
 </tr> 
 <tr> 
 <td><a href="https://www.jc2182.com/javascript-string-valueof-method/1978.html" rel="nofollow">valueOf()</a></td> 
 <td>返回String对象的原始值</td> 
 </tr> 
 </tbody> 
</table>

# 字符串HTML包装器方法 #

HTML包装器方法返回包含在相应HTML标记内的字符串。这些不是标准方法，并且可能无法在所有浏览器中按预期工作。

转载于:https://www.cnblogs.com/jc2182/p/11258645.html