JS 字符串函数

2017-08-13 11:23:12 Albin Wong 459

`var str = ' i love You ';`
1. 统计字符串长度
var len = str.length; // 12

2. 清除两侧空白 (仅能清除空白字符)  
var res = str.trim(); // i love you  
var res = str.trim('@');

3. 获取指定索引位置上的字符  $str = 'iloveyou'; PHP $str[5]; $str{5};  
var ch = str.charAt(5); // v 获取字符串指定位置的值

4. 获取字符串首次出现的位置  
var pos = str.indexOf('o'); // 4

5. 获取最后一次出现的位置  
var lpos = str.lastIndexOf('o'); // 9

6. 用来连接两个或者多个字符串  
var res = str.concat(' do you love me?? ','no','why?','no why');  
var res = str + '!!iloveyoutoo!';

7. 拆分字符串 返回数组  
var str = '@i@love@you@';  
var res = str.split('@');

8. 按照长度来截取字符串  
var res = str.substr(3, 4); // love 从哪开始截取长度

9. 按照索引的位置来截取字符串  开始位置到结束位置 要头不要尾  
var res = str.slice(3,7); // love  
var res = str.substring(3,7); // love

10. 大小写转换  $user->where()->limit()->order()->select()  
var res = str.toUpperCase();  
var res = str.toLowerCase();

11. 字符串替换  
var str = 'iloveyou';  
var res = str.replace('love','miss'); // imissyou

截取并转变成大写  
var str = 'i HaVe a HAt';
var res = str.substr(2,4).toUpperCase(); // HAVE

(3) Comments

John Doe- Reply

February 26, 2013 at 1:18 pm
- saqib sarwar- Reply
  
  February 26, 2013 at 1:20 pm
  
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John Doe- Reply

February 26, 2013 at 1:27 pm

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JS 字符串函数

(3) Comments

John Doe- Reply

saqib sarwar- Reply

John Doe- Reply

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