JavaScript removes string spaces before and after

Usage scenarios:

When we make some page edits, the space before and after the string is usually invalid. Therefore, you need to filter when you get the information.

Like what:

　　input : [space] [space]a[space]b[space] [space] [space]

　　get : a[space]b

The code is as follows:

Remove the preceding space

1 functionLTrim (str) {2     vari;3      for(i=0;i<str.length;i++){4         if(Str.charat (i)! = "") 5              Break; 6     } 7str =str.substring (i,str.length);8     returnstr;9 } Ten     

Remove the space behind

1 functionRTrim (str) {2     vari;3      for(i=str.length-1;i>=0;i--){ 4         if(Str.charat (i)! = "") 5              Break; 6     } 7str = str.substring (0,i+1); 8     returnstr;9}

How to use

1 function  2     return3 }

JavaScript removes string spaces before and after