JavaScript字符串截取方法详解-优快云博客

 
 <script type= 
 "text/javascript" 
 >  
 
 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)); 
 //--------""  
 
 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)); 
 //-----------""  
 
 </script> 