charAt():
根据下标返回字符
1 <script> 2 let str = 'abcde'; 3 console.log(str.charAt(1)); //返回结果:b 4</script>
charCodeAt():
根据下标返回字符的ASCII码值
1 <script> 2 let str = 'abcde'; 3 console.log(str.charCodeAt(1)); //返回结果:98 4</script>
b的ASCII码值是98
replace():
替换字符串,第一个参数是被替换的字符串,第二个参数是要替换的字符串
只会替换一个字符串或者字符
1 <script> 2 let str = 'abcdea'; 3 console.log(str.replace('a', 'b')); //结果:bbcdea 4</script>
split():
字符串分割成数组
1 <script> 2 let str = 'a,b,c'; 3 console.log(str.split(',')); 4</script>
substr(():
字符串截取
第一个参数是从哪个下标开始截取,第二个参数是截取多少个字符
1 <script> 2 let str = 'abcdef'; 3 console.log(str.substr(1, 3)); //bcd 4</script>
标签:console,charAt,JavaScript,replace,let,str,字符串,log From: https://www.cnblogs.com/weixuezhe/p/16806089.html