43 第二次作业
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2022-05-04 12:21:13
1、省城市的三级联动 结果截图: 2、移出数组arr([1,2,3,4,2,5,6,2,7,2])中与2相等的元素,并生成一个新数组,不改变原数组。 效果图: 3、编写函数实现单击change按钮,为div元素添加红色双线的边框。 效果图: 2019-10-17 20:14:31 ......
1、省城市的三级联动
1 <select id="province"> 2 <option value="-1">请选择</option> 3 </select> 4 <select id="city"></select> 5 <select id="country"></select> 6 <script type="text/javascript"> 7 var provincearr = ['上海','江苏','湖南']; 8 var cityarr = [ 9 ['上海市'], 10 ['苏州市','南京市','扬州市'], 11 ['长沙市','常德市','张家界市'] 12 ]; 13 var countryarr = [ 14 [ 15 ['黄浦区','静安区','长宁区','浦东区'] 16 ], 17 [ 18 ['虎丘区','吴中区','相城区','姑苏区','吴江区'], 19 ['玄武区','秦淮区','建邺区','鼓楼区','浦口区'], 20 ['邗江区 ','广陵区','江都区'] 21 ], 22 [ 23 ['岳麓区','雨花区','望城区','芙蓉区'], 24 ['武陵区','鼎城区'], 25 ['永定区','武陵源区'] 26 ] 27 ]; 28 function createoption(obj,data){ 29 for(var i in data){ 30 var op = new option(data[i],i); 31 obj.options.add(op); 32 } 33 } 34 var province = document.getelementbyid('province'); 35 createoption(province,provincearr); 36 var city = document.getelementbyid('city'); 37 province.onchange = function(){ 38 city.options.length = 0; 39 createoption(city,cityarr[province.value]); 40 }; 41 var country = document.getelementbyid('country'); 42 city.onchange = function(){ 43 country.options.length = 0; 44 createoption(country,countryarr[province.value][city.value]); 45 }; 46 province.onchange = function(){ 47 city.options.length = 0; 48 createoption(city,cityarr[province.value]); 49 if(province.value>=0){ 50 city.onchange(); 51 } 52 else{ 53 country.options.length = 0; 54 } 55 }; 56 </script>
结果截图:
2、移出数组arr([1,2,3,4,2,5,6,2,7,2])中与2相等的元素,并生成一个新数组,不改变原数组。
1 var arr = [1,2,3,4,2,5,6,2,7,2]; 2 document.write("原数组:<br/>" + arr); 3 var a= arr.slice(3,4); 4 var b = arr.slice(0,1); 5 var c = arr.slice(2,3); 6 var d = arr.slice(5,6); 7 var e = arr.slice(6,7); 8 var f = arr.slice(8,9); 9 str = b.concat(c,a,d,e,f); 10 document.write("<br/>"); 11 document.write("新数组:<br/>" + str); 12 document.write("<br/>"); 13 document.write("原数组arr:<br/>" + arr);
效果图:
3、编写函数实现单击change按钮,为div元素添加红色双线的边框。
1 <head> 2 <meta charset="utf-8"> 3 <style type="text/css"> 4 div{ 5 font-family: "helvetica neue",helvetica,arial,"microsoft yahei",sans-serif; 6 width: 600px; 7 text-align: center; 8 } 9 .haha{ 10 margin-top: 20px; 11 margin-left: 250px; 12 font-size: 20px; 13 } 14 .haha:hover{ 15 border: 3px solid purple; 16 } 17 </style> 18 </head> 19 <body> 20 <div id="joy"> 21 <p>努力学习</p> 22 </div> 23 <button class="haha" onclick="myfunction()">change</button> 24 <script type="text/javascript"> 25 function myfunction(){ 26 var color = document.getelementbyid("joy"); 27 color.style.border = "3px double red"; 28 color.innerhtml = "<p>加油!</p>"; 29 30 } 31 </script> 32 </body>
效果图:
2019-10-17 20:14:31
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