文档介绍：1.<scriptlanguage="javascript"type="text/javascript">newfunction(s){if(!||!s)returnnull;if(""==s)return0;varl=0;for(vari=0;i<;i++){  if((i)>255)l+=2;  elsel++;}alert(l);}("hello你好,我好,大家好!world!");</script>2.<scriptlanguage="javascript"type="text/javascript">alert("hello\nworld");</script>。5.<scriptlanguage="javascript"type="text/javascript">newfunction(){with(newDate()){  vart=function(a){returna<10?"0"+a:a;}  alert(getFullYear()+"年"+t(getMonth()+1)+"月"+t(getDate())+"日"+t(getHours())+"时"+t(getMinutes())+"分"+t(getSeconds())+"秒");}}</script>6.<scriptlanguage="javascript"type="text/javascript">=function(){if(<2)return[this[0]]||[];vararr=[];for(vari=0;i<;i++){  ((i--,1));  for(varj=0;j<;j++)  {   if(this[j]==arr[-1])   {    (j--,1);   }  }}returnarr;}vararr=["abc",85,"abc",85,8,8,1,2,5,4,7,8];alert(());</script>