onclick = function() { //让我们当前元素的类名改为了change this.className = 'change'; } 如果样式修改比较多,可以采取操作类名方式更改元素样式 class因为是个保留字,因此使用className来操作元素类名属性 className会直接更改元素的类名,会覆盖原先的类名 注意:如果想要保留原先的类名,可以选择多类名选择...
第二个参数,从下标哪里查找 arrayObject.lastIndexOf();从数组的末尾开始查找functionArrayIndexOf(arr,value){// 检测value在arr中出现的位置for(vari=0;i<arr.length;i++){if(arr[i]===value){returni;}}return-1;} 字符串对象 代码语言:javascript 代码运行次数:0 运行 AI代码解释 charAt()stringObject...
option.value = roleArray[i]; option.text = roleArray[i]; x.appendChild(option); } $('#role').on('change', function() { role = $('#role option:checked').val(); this.selectedOptions[0].setAttribute('value', role); x.setAttribute("value", role); console.log(x); }); x.setAtt...
content string | function '' default content value if `data-content` attribute isn't present delay number | object 0 delay showing and hiding the popover (ms) - does not apply to manual trigger type If a number is supplied, delay is applied to both hide/show Object structure is: delay:...
匈牙利类型标记法:在以Pascal 标记法命名的变量前附加一个小写字母(或小写字母序列,说明该变量的类型)。例如:i 表示整数 ,s 表示字符串,例如:Var iMyTestValue = 0, sMySecondValue = 'hi'; 2,JavaScript 关键字 3,JavaScript 数据类型 数据类型分为:基本数据类型和引用数据类型。如下: ...
element.attribute = new valueChange the attribute value of an HTML element element.style.property = new styleChange the style of an HTML element MethodDescription element.setAttribute(attribute, value)Change the attribute value of an HTML element ...
// Change a Property Object.defineProperty(person,"language",{value :"NO"}); Try it Yourself » Property Attributes All properties have a name. In addition they also have a value. The value is one of the property's attributes.
MutationObserver(()=>console.log("change"));// 监听body元素的属性变化observer.observe(document.body,{attributes:true});// 更改body元素的class,会异步执行创建MutationObserver对象时传入的回调函数document.body.className="main";console.log("修改了body属性");// 控制台输出:// 修改了body属性// change...
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...
change:对于input和textarea元素,值发生改变的时候触发; focus: 当前字段获得焦点时触发; 理解文本框脚本 在HTML中,有2种方式来实现文本框,一种是input元素的单行文本框,另一种是textarea元素的多行文本框; input元素有属性type=”text”, 还可以通过设置size属性,用来指定文本框显示的字符数,还可以设置value,用来...