代码如下:funtion setSelectOption(a,b){//a =>select 的id名,b=>已知option的值 for (i=0;i<$(a).length;i++) //$(a)获取a的id的简单写法,前提是必须用引用prototype.js if($(a).options[i].value == b){//遍历select $(a).options[i].selected=true;//选中特定值 break; }...
1. $("#select_id").append("<option value='Value'>Text</option>"); //为Select追加一个Option(下拉项) 2. $("#select_id").prepend("<option value='0'>请选择</option>"); //为Select插入一个Option(第一个位置) 3. $("#select_id option:last").remove(); //删除Select中索引值最大O...
1. Set selected option with value The method of javascript set selected option is exactly the same as the background. The html code is as follows: <selectid="selecteId"> <optionvalue="0">Please select</option> <optionvalue="1">Option 1</option> <optionvalue="2">Option 2</option> <...
下面我们通过一个示例来演示如何使用 JavaScript 设置selected属性。 <selectid="mySelect"><optionvalue="option1">Option 1</option><optionvalue="option2">Option 2</option><optionvalue="option3">Option 3</option></select><buttononclick="setSelected()">Set Option 2 as Selected</button><script>f...
Return Value TypeDescription IteratorAn iterable object with the values of the set. Related Pages: JavaScript Sets JavaScript Iterables Full JavaScript Set Reference More Examples Looping the set.values() directly: // Create a Set constletters =newSet(["a","b","c"]); ...
If the collapsible element is closed by default, it should have a value of aria-expanded="false". If you've set the collapsible element to be open by default using the in class, set aria-expanded="true" on the control instead. The plugin will automatically toggle this attribute based on...
Select.selectedIndex is 0-based.但是第0项是“请选择省份-- ” --> <select name="select" id="province" onchange="setCity(this.selectedIndex);"> <option value="0">请选择省份--</option> </select> <select name="select2" id="city"> <option value="0">请选择城市--</option> </select>...
If the collapsible element is closed by default, it should have a value of aria-expanded="false". If you've set the collapsible element to be open by default using the in class, set aria-expanded="true" on the control instead. The plugin will automatically toggle this attribute based on...
// enum.jsexportfunctionEnum(baseEnum){returnnewProxy(baseEnum,{get(target,name){if(!baseEnum.hasOwnProperty(name)){thrownewError(`"${name}" value does not exist in the enum`)}returnbaseEnum[name]},set(target,name,value){thrownewError('Cannot add a new value to the enum')}})} ...
一、JavaScript的补充 1 正则表达式 1.1 test的使用 test 测试是否符合条件 返回true or false 1.2 exec的使用 exec 从字符串中截取匹配的字符 1.3 分组 -/g /m /i 分组 JavaScript 正则表达式- test 测试是否符合条件 返回