js截取长度

//截取长度 function SetString(str,len){ var strlen = 0; var s = ""; for(var i = 0;i < str.length;i++){ if(str.charCodeAt(i) > 128){ strlen += 2; }else{ strlen++; } s += str.charAt(i); if(strlen >= len){ return s+"..." ; } } return s; }