javascript 문자열 캡 처 (substring 을 통 해 중 영문 혼합 지원)

 
  
 
  <br>var sub=function(str,n){ 
  <br>var r=/[^\x00-\xff]/g; 
  <br>if(str.replace(r,"mm").length<=n){return str;} 
  <br>var m=Math.floor(n/2); 
  <br>for(var i=m;i<str.length;i++){ 
  <br>if(str.substr(0,i).replace(r,"mm").length>=n){ 
  <br>return str.substr(0,i)+"..."; 
  <br>} 
  <br>} 
  <br>return str; 
  <br>} 
  <br>alert(sub('     Javascript    (Js         )',15)) 
  <br> 
  
 
 

 
  
var str = "0123456789"; 
  
alert(str.substring(0));------------"0123456789" 
  
alert(str.substring(5));------------"56789" 
  
alert(str.substring(10));-----------"" 
  
alert(str.substring(12));-----------"" 
  
alert(str.substring(-5));-----------"0123456789" 
  
alert(str.substring(-10));----------"0123456789" 
  
alert(str.substring(-12));----------"0123456789" 
  
alert(str.substring(0,5));----------"01234" 
  
alert(str.substring(0,10));---------"0123456789" 
  
alert(str.substring(0,12));---------"0123456789" 
  
alert(str.substring(2,0));----------"01" 
  
alert(str.substring(2,2));----------"" 
  
alert(str.substring(2,5));----------"234" 
  
alert(str.substring(2,12));---------"23456789" 
  
alert(str.substring(2,-2));---------"01" 
  
alert(str.substring(-1,5));---------"01234" 
  
alert(str.substring(-1,-5));--------"" 
  
 
 

 
  
var str = "0123456789"; 
  
alert(str.substr(0));---------------"0123456789" 
  
alert(str.substr(5));---------------"56789" 
  
alert(str.substr(10));--------------"" 
  
alert(str.substr(12));--------------"" 
  
alert(str.substr(-5));--------------"0123456789" 
  
alert(str.substr(-10));-------------"0123456789" 
  
alert(str.substr(-12));-------------"0123456789" 
  
alert(str.substr(0,5));-------------"01234" 
  
alert(str.substr(0,10));------------"0123456789" 
  
alert(str.substr(0,12));------------"0123456789" 
  
alert(str.substr(2,0));-------------"" 
  
alert(str.substr(2,2));-------------"23" 
  
alert(str.substr(2,5));-------------"23456" 
  
alert(str.substr(2,12));------------"23456789" 
  
alert(str.substr(2,-2));------------"" 
  
alert(str.substr(-1,5));------------"01234" 
  
alert(str.substr(-1,-5));-----------""