第二次作业

任务1

<!DOCTYPE html>
<html>
<head>
    <title>完成省城市的三级联动（包括湖南省），附代码和效果图。</title>
</head>
<body>
 <select id="province">
   <option value="-1">请选择</option>
 </select>
 <select id="city"></select>
 <select id="country"></select>
 <script type="text/javascript">
   var provinceArr = ['上海','江苏','河北','湖南'];
   var cityArr = [
                  ['上海市'],
                  ['苏州市','南京市','扬州市'],
                  ['石家庄','秦皇岛','张家口'],
                  ['长沙市','株洲市','湘潭市']
                 ];
    var countryArr =[ 
                     [
                      ['黄浦区','静安区','长宁区','浦东区']
                     ],
                     [
                      ['虎丘区','吴中区','相城区','姑苏区','吴江区'],
                      ['玄武区','秦淮区','建邺区','鼓楼区','浦口区'],
                      ['邗江区','广陵区','江都区']
                     ],
                     [
                      ['长安区','桥西区','新华区','井陉矿区'],
                      ['海港区','山海关区','北戴河区','抚宁区'],
                      ['桥东区','桥西区','宣化区','下花园区']
                     ],
                     [
                      ['芙蓉区','岳麓区','天心区','开福区'],
                      ['荷塘区','芦淞区','石峰区','天元区'],
                      ['雨湖区','岳塘区']
                     ]
                    ];
    function creatOption(obj,data){
        for(var i in data){
            var op = new Option(data[i],i);
            obj.options.add(op);
        }
    }
    var province = document.getElementById('province');
    creatOption(province,provinceArr);   

    var city = document.getElementById("city");
    province.onchange = function(){
        city.options.length = 0;
        creatOption(city,cityArr[province.value]);
        if(province.value >= 0){
            city.onchange();
        }else{
            country.options.length = 0;
        }
    };

    var country = document.getElementById("country");
    city.onchange = function(){
        country.options.length = 0;
        creatOption(country,countryArr[province.value][city.value]);
    };              
 </script>
</body>
</html>

 任务二

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<script>
			var arr = new Array(1,2,3,4,2,5,6,2,7,2);
			var arr2 = new Array();
			for(var i =0,j=0; i<arr.length-1; i++){
				if(arr[i]!=2){
					arr2[j]=arr[i];
					j++;
				}
			}
			document.write(arr2);
		</script>
	</head>
	<body>
	</body>
</html>

 任务三

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>编写函数实现单击change按钮，为div元素添加红色双线的边框。</title>
    <style type="text/css">
        div{
            font-family: "Helvetica Neue",Helvetica,Arial,"Microsoft Yahei",sans-serif;
            width: 600px;
            text-align: center;
        }
        .haha{
            margin-top: 20px;
            margin-left: 250px;
            font-size: 20px;
        }
        .haha:hover{
            border: 3px solid purple;
        }
    </style>
</head>
<body>
   <div id="joy">
      <p>咱们什么都没有，唯一的本钱就是青春。</p>
   </div>
   <button class="haha" onclick="myFunction()">change</button>
   <script type="text/javascript">
    function  myFunction(){
        var Color = document.getElementById("joy");
        Color.style.border = "3px double red";
        Color.innerHTML = "<p>那就努力改变自己吧，不辜负这大好的青春，不辜负自己！</p>";
       
    }
    </script>
</body>
</html>

 任务四

我觉得此次实训内容有点多，但是自己能力得到了很好的训练

posted on 2019-10-16 20:14  兰天祥  阅读(160)  评论(0)    收藏  举报

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