fason 的 apply & call for IE5

fason 的 apply & call for IE5

 

if ( typeof (Function.prototype.apply) != " function " )
{
  Function.prototype.apply  =   function (obj, argu)
  {
     var  s;
     if (obj)
    {
      obj.constructor.prototype._caller = this ;
      s  =   " obj._caller " ;
    }
     else  s  =   " this " ;
     var  a = [];
     for ( var  i = 0 ; i < argu.length; i ++ )
      a[i]  =   " argu[ " +  i  + " ] " ;
     return  eval(s  + " ( " +  a.join( " , " )  + " ); " );
  };
  Function.prototype.call   =   function (obj)
  {
     var  a = [];
     for ( var  i = 1 ; i < arguments.length; i ++ )
      a[i - 1 ] = arguments[i];
     return   this .apply(obj, a);
  }; 
}