JS string and array methods

JS String method ：

indexOf Look back before （ Commonly used lastIndexOf Look backwards

indexOf Has two functions
1. You can detect the position of elements in the array
2. You can detect whether there is this element in the array （ duplicate removal ）

charAt understand  str[1]
charCodeAt understand

slice   Intercept
substr 
substring 

replace String substitution , It can only be replaced once

split Turn a string into an array Split

toUpperCase Convert to uppercase
toLowerCase Convert to lowercase

JS Array method ：

reverse Flip
sort Sort
push Add... From the back
unshift Add... From the front
pop Delete... From the back
shift Remove... From the front
indexOf From front to back string index
lastIndexOf String index from back to front
join,toString Convert to string type , It is recommended to use join
concat Become
slice Intercept （ A large array is only a part of a fragment ）
splice Delete
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