1if(navigator.userAgent.indexOf("Firefox")>0){2return"Firefox";3}elseif(navigator.userAgent.indexOf("Chrome")>0){4return"Chrome";5}elseif(navigator.userAgent.indexOf("Opera")>0){6return"Opera";7} 以navigator.userAgent.indexOf("Opera")查询来讲,若打开的浏览器是欧朋则返回一个大于0的值,...
console.log(string.indexOf("d",4));//-1 indexOf()方法还常用来判断浏览器的类型,其用法如下: 1 if(navigator.userAgent.indexOf("Firefox")>0){ 2 return "Firefox"; 3 }else if(navigator.userAgent.indexOf("Chrome")>0){ 4 return "Chrome"; 5 }else if(navigator.userAgent.indexOf("Opera"...
typeof PAYMENT_MODE[number] 等效 mode1[number],我们知道mode1[]是indexed access types,[]中Index来源于Index Type Query也即keyof操作 。 type mode1 =keyof typeof PAYMENT_MODE // number | "0" | "1" | "2" | "length" | "toString" | "toLocaleString" | "concat" | "join" | "slice" ...
1. TYPE tabletypeIS TABLE OFtypeINDEX BYBINARY_INTEGER; 定义:TYPE t_charTableIS TABLE OFVARCHAR2(10)INDEX BYBINARY_INTEGER; 引用:tableName(index); Oracle中index by binary_integer的作用 如语句:type numbers is table of number index by binary_integer;其作用是,加了”index by binary_integer ”...
functiontryGetArrayElement<T>(arr?: T[], index:number= 0){ returnarr?.[index]; } 以上代码经过编译后会生成以下 ES5 代码: "use strict"; functiontryGetArrayElement(arr, index){ if(index ===void0) { index =0; } returnarr ===null|| arr ===void0?void0: arr[index]; ...
If you have .d.ts files besides index.d.ts, make sure that they are referenced either in index.d.ts or the tests. Definitely Typed members routinely monitor for new PRs, though keep in mind that the number of other PRs may slow things down. For a good example package, see base64-js...
当我们尝试使用不能用于索引数组或对象的类型时,会出现错误“Type cannot be used as an index type”,例如 非原始类型之一,如String。 要解决错误,需要使用原始(小写)类型,例如 键入值时的number或string。 下面是产生上述错误的一个示例。 // ✅ With arrays (should be `number`)constnum:Number=1;const...
PhoneNumberKeyType PhoneType PhysicalAddressDictionaryEntryType PhysicalAddressIndexType PhysicalAddressKeyType PinInfoType PlayOnPhoneCompletedEventArgs PlayOnPhoneCompletedEventHandler PlayOnPhoneResponseMessageType PlayOnPhoneType PolicyNudgeRulesServiceConfiguration PostalAddressAttributedValueType PostItemType PostReply...
charAt(index: number): string 返回指定索引位置的字符。 代码语言:typescript 复制 letstr:string='Hello, World!';console.log(str.charAt(1));// 输出:e indexOf(searchValue: string, startIndex?: number): number 返回第一个找到的指定字符串或字符的索引位置,可指定起始搜索位置。
XlBordersIndex XlBorderWeight XlBuiltInDialog XlCalcFor XlCalcMemNumberFormatType XlCalculatedMemberType XlCalculation XlCalculationInterruptKey XlCalculationState XlCategoryLabelLevel XlCategoryType XlCellChangedState XlCellInsertionMode XlCellType XlChartElementPosition XlChartGallery XlChartItem XlChartLocation Xl...