<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> </head> <body> <script type="text/javascript"> /*
在js中字符串可以看做一个特殊的数组, 所以大部分数组的属性/方法字符串都可以使用
*/ // 1.获取字符串长度 .length let a="abcd"; //console.log(a.length); // 2.获取某个字符 [索引] / charAt let b="abcd"; let c=b.charAt(1); //console.log(c); // 3.字符串查找 indexOf / lastIndexOf / includes let aa="abcde"; let ss=aa.indexOf("c"); //console.log(ss); let sss=aa.lastIndexOf("e");//从后往前数第一个e console.log(sss); let ddd=aa.includes("ss"); console.log(ddd); // 4.拼接字符串 concat / + let str1 = "www"; let str2 = "it666"; let x=str2+str1; console.log(x); let v=str1.concat(str2); console.log(v); // 5.截取子串 slice / substring / substr let str = "abcdef"; let m=str.slice(1,3);//从下标1开始截取两位。 console.log(m); let subStr = str.substring(1, 3); console.log(subStr); let f=str.substr(1,3);//从下标1开始截取三位. console.log(f); </script> </body> </html>
详解length charAt indexOf lastIndexOf includes concat slice substring substr详解
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