select 相關操作

IE 、FireFox下測試均通過：

動態添加option:

    //GT是類似這樣的數組:var GT = [['a','b','c','d'],['e','f'],['g','h','i']];
    //obj1是select對象 var obj1 = document.getElementById("select的ID");
    $.each( GT[2] , function(index,data){
	 // alert(index +  "   "  +data);
	 var op = document.createElement("option");
	 op.text = data;
	 op.value = data;
	 obj1.options.add(op);
    });

動態刪除option:

      obj1.options.length = 0;