1.charAt()數組
查找返回指定位置的字符spa
var str = "abcdefg"; var s = str.charAt(5); // 下標爲5的字符 console.log(s);//f
2.charcodeAt()code
查找返回指定位置字符的unicdoe碼blog
var str = "abcdefg"; var s = str.charCodeAt(5); // 下標爲5的字符的unicdoe碼 console.log(s);//102
3.concat()字符串
鏈接字符串input
var str = "abc"; var str1 = str.concat("a", "b", "c", "dsdafsdafsad"); console.log(str1);//abcabcdsdafsdafsad
4.slice()string
字符串截取
it
var str = "abcdefghijklm"; var str1 = str.slice(1, 5); console.log(str1);//bcde
詳細用法請參考數組用法。console
5.split()class
將字符串轉換爲數組
var str = "abcdefg" var str1 =str.split("") console.log(str);//abcdefg console.log(str1)//["a", "b", "c", "d", "e", "f", "g"]
6.substring()
字符串截取
var str = "abcdefghijklm"; var str1 = str.substring(1, 9);//從下邊1開始到下邊9結束不包括下標9那一項 var str2 = str.substring(9, 1); console.log(str1);//bcdefghi console.log(str2);//bcdefghi
7.substr()
字符串截取
var str = "abcdefghijklm"; var str1 = str.substr(2, 6);//從下標2開始日後數6個數 console.log(str1);//cdefgh
8.indexOf()
遍歷字符串
查找包含第一個參數的字符串,如包含返回第一位的下標,中止查找,如沒有返回 -1。第二個參數表示今後下標開始查找。
var str = "abcdefabcjklm"; var a = str.indexOf("abc") var b = str.indexOf("abc", 1); console.log(a);//0 console.log(b);//6
9.toUpperCase
轉大寫
var str = "aAbBcCdD"; console.log(str.toUpperCase());//AABBCCDD
10.toLowerCase
轉小寫
var str = "aAbBcCdD"; console.log(str.toLowerCase());//aabbccdd
11.replace()
替換字符串
只能匹配一次
var str = "今每天每天氣好好"; var str1 = str.replace("每天", "**"); console.log(str1);//今**每天氣好好
12.match()
查找字符串
var str = "今每天氣好好"; var result = str.match("每天"); console.log(result);//["每天", index: 1, input: "今每天氣好好", groups: undefined]
13.search()
查找字符串返回下標
var str = "今每天氣每天好好"; var result = str.search("每天"); console.log(result);//1
14.startsWith
var str = "hello world"; var result = str.startsWith("he"); console.log(result)//true //當爲兩個參數時,第二個表示開始位數。 var result = str.startsWith("he",1); console.log(result)//flase
15.endsWith
var str = "hello world"; //檢測尾部 var result = str.endsWith("world"); console.log(result);//true //檢測指定位置是否以指定字符結尾 var result1 = str.endsWith("wo", 8); console.log(result1)//true
16.includes
檢測是否包含指定字符串
var str = "hello world"; var result = str.includes("o"); console.log(result);//true var result1 = str.includes("o", 8); console.log(result1);//false
17.repeat
重複字符串
var str ="haha" var str1 = str.repeat(3); console.log(str1)//hahahahahaha