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[Java教程]使用Javascript来实现二级联动菜单的效果


效果图如下:

 

具体实现步骤如下:

1.所用js代码如下:

<script type="text/javascript">var arr_province=["请选择省份/城市","北京市","上海市","天津市","河南省","山东省","河北省"];var arr_city=[        ["请选择城市/地区"],        ["中关村","海淀区","朝阳区","昌平区","丰台区","大兴区"],        ["宝坻区","浦东新区","长宁区","徐汇区","虹口区","宝山区"],        ["和平区","河东区","河西区","塘沽区","大港区","北辰区"],        ["郑州市","洛阳市","商丘市","开封市","安阳市","濮阳市"],        ["济南市","青岛市","烟台市","德州市"],        ["石家庄","菏泽市","唐山市"],      ];function init(){  var province=document.form1.province;  province.style.width=150+"px";  var city=document.form1.city;  city.style.width=150+"px";  //给province赋值高度,才能在其里面写入内容  province.length=arr_province.length;  for(var i=0;i<arr_province.length;i++)  {    province.options[i].text=arr_province[i];    province.options[i].value=arr_province[i];  }  //设置默认被选中的选项  var index=0;  province.selectedIndex=index;  //给city赋值高度,才能在其里面写入内容  city.length=arr_city[index].length;  for(var j=0;j<arr_city[index].length;j++)  {    city.options[j].text=arr_city[index][j];    city.options[j].value=arr_city[index][j];  }  }function select_change(num){  var city=document.form1.city;  city.length=0;  city.length=arr_city[num].length;  for(var i=0; i<arr_city[num].length;i++)  {    city.options[i].text=arr_city[num][i];    city.options[i].value=arr_city[num][i];  }}</script>

2.body中的代码如下:

<body onload="init()">  <form name="form1">  所在地区:<select name="province" onchange="select_change(this.selectedIndex)"></select>  城市:<select name="city"></select>  </form></body>

 1.利用javascript来实现鼠标经过图片放大,鼠标移出图片恢复的效果,具体代码如下:

<script type="text/javascript">function init(){  var img0=document.getElementById("img0");  img0.onmouseover=function()      {        img0.style.width=img0.offsetWidth*1.5+"px"      }  img0.onmouseout=function()      {        img0.style.width=img0.offsetWidth/1.5+"px"      }}</script>

2.body中的代码如下:

<body onload="init()"><img id="img0" src="images/4.jpg" /></body>