The string operator of JS

1. Character method

// the character ' Zhangamie ' of the output index value . charAt (2)  //  "a"//"a"//  output code A's Ascill code is the"Zhangamie". charCodeAt (2)  ///string.fromcharcode ($)  //  ' a '

2. String methods

Concat, slice, substr, substring do not affect the original string

 //  connect   var  name = ' Zhang ' ;  var  newName = Name.concat (' amie '  // zhang  console.log (newName ) // zhang amie  //  intercept string  // slice, substr, substring the first parameter is the index of the start position  // slice and substr can accept negative numbers (automatically converted to length-/negative numbers/)  // slice, substring the second parameter is the end index, not the match to the end  // substr The second parameter is the number of captures, not the match to the end  
 

3. String Position method

IndexOf and LastIndexOf, the first argument to match the string, the second parameter is the location to start looking for

// 5

4.trim clear space before and after

'    z  hangamie     '. Trim ()  //"z  hangamie"

5. Match

var name = ' Cat,bat,sat,fat 'name.match (/.at/g)  //["Cat", "bat", "sat", "fat "]//8 indexof is not accepted regexp//" ABC,ABC,ABC,ABC "does not affect the meta-string

The string operator of JS