Remove character unicode(Vietnamese) with javascript

Sometimes you need to remove the Vietnamese characters orunicode characters.
One way is that you remove these characters with javascriptbefore.
For example:



function remove_unicode(str) 
{  
 str= str.toLowerCase();  
 str= str.replace(/à|á|ạ|ả|ã|â|ầ|ấ|ậ|ẩ|ẫ|ă|ằ|ắ|ặ|ẳ|ẵ/g,"a");  
 str= str.replace(/è|é|ẹ|ẻ|ẽ|ê|ề|ế|ệ|ể|ễ/g,"e");  
 str= str.replace(/ì|í|ị|ỉ|ĩ/g,"i");  
 str= str.replace(/ò|ó|ọ|ỏ|õ|ô|ồ|ố|ộ|ổ|ỗ|ơ|ờ|ớ|ợ|ở|ỡ/g,"o");  
 str= str.replace(/ù|ú|ụ|ủ|ũ|ư|ừ|ứ|ự|ử|ữ/g,"u");  
 str= str.replace(/ỳ|ý|ỵ|ỷ|ỹ/g,"y");  
 str= str.replace(/đ/g,"d");  
 str= str.replace(/!|@|%|\^|\*|\(|\)|\+|\=|\<|\>|\?|\/|,|\.|\:|\;|\'| |\"|\&|\#|\[|\]|~|$|_/g,"-"); 

 str= str.replace(/-+-/g,"-"); //thay thế 2- thành 1- 
 str= str.replace(/^\-+|\-+$/g,"");  

 return str;  
}