typescript入门,typescript特性
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typescript的介绍这里就不提,之前文章中有,目前typescript还不能直接运行在浏览器中,所以需要使用compiler进行编译成JavaScript文件进行运行。/*特性一:字符串新特性*//*1、多行字符串*/var content = `aaabbbccc`;*******************************************编译出js为:var content = "aaa\nbbb\nccc";
*******************************************/*2、字符串模板*/var myName = 'xuchg';var getName = function(){ return 'xuchg';};console.log(`my name is ${myName}`);console.log(`also ${getName()}`);
*******************************************编译出js为:var myName = 'xuchg';var getName = function () {return 'xuchg';};console.log("my name is " + myName);console.log("also " + getName());
*******************************************//构建HTML模板console.log(` <div> <span>${myName}</span> <span>${getName()}</span> </div>`);
*******************************************编译出js为:console.log("\n <div>\n <span>" + myName + "</span>\n <span>" + getName() + "</span>\n </div>\n");
*******************************************/*3、自动拆分字符串*/function test(temp,name,age){ console.log(temp); console.log(name); console.log(age);}var myName1 = "xuchg";var getAge = function(){ return 23;}test`hello my name is ${myName1} I am ${getAge()}`;
*******************************************编译出js为:/*二、参数新特性*/var myName2:string = "xuchg";//typescript类型推断var alias = "hehe";//报错// alias = 12;var alias1:any = "这是一个任意类型";function test(temp, name, age) {console.log(temp);console.log(name);console.log(age);}var myName1 = "xuchg";var getAge = function () {return 23;};(_a = ["hello my name is ", " I am ", ""], _a.raw = ["hello my name is ", " I am ", ""], test(_a, myName1, getAge()));
*******************************************var age:number = 21;var man:boolean = true;function testReturn(name:string):string{ return "这是一个参数和返回值定义类型的方法";}//自定义类型class Person{ name:string; age:number;}var xcg:Person = new Person();xcg.name = "xuchg";xcg.age = 23;
*******************************************编译出js为:/*2、参数默认值*/var myName3:string = "xuchg";function testVal(a:string,b:string,c:string="这是默认值"){ console.log(a); console.log(b); console.log(c);}//注意:带默认值得参数要声明在最后testVal("aaa","bbb","CCC");testVal("aaa","bbb");var myName2 = "xuchg";//typescript类型推断var alias = "hehe";//报错// alias = 12;var alias1 = "这是一个任意类型";var age = 21;var man = true;function testReturn(name) {return "这是一个参数和返回值定义类型的方法";}//自定义类型var Person = (function () {function Person() {}return Person;}());var xcg = new Person();xcg.name = "xuchg";xcg.age = 23;
*******************************************
*******************************************编译出js为:var myName3 = "xuchg";function testVal(a, b, c) {if (c === void 0) { c = "这是默认值"; }console.log(a);console.log(b);console.log(c);} //注意:带默认值得参数要声明在最后
*******************************************/*3、可选参数:?*/function testChange(a:string,b?:string,c:string="这是默认值"){ console.log(a); console.log(b.length);//注意:声明了可选参数需要在函数中进行处理,否则会出现错误,而且可选参数不能声明在必选参数的前面 console.log(c);}testChange("XXX");
*******************************************编译出js为:function testChange(a, b, c) {if (c === void 0) { c = "这是默认值"; }console.log(a);console.log(b.length); //注意:声明了可选参数需要在函数中进行处理,否则会出现错误,而且可选参数不能声明在必选参数的前面console.log(c);}testChange("XXX");/*三、函数新特性*//*1、rest and spread操作符,就是用来声明任意数量的方法参数,相当于Java的可变参数*/function rs1(...args){ args.forEach(function(arg){ console.log(arg); })}rs1(1,2,3);rs1(4,5,6,7,8,9);
*******************************************
*******************************************编译出js为:function rs1() {var args = [];for (var _i = 0; _i < arguments.length; _i++) {args[_i] = arguments[_i];}args.forEach(function (arg) {console.log(arg);});}rs1(1, 2, 3);rs1(4, 5, 6, 7, 8, 9);//另一种情况function rs2(a,b,c){ console.log(a); console.log(b); console.log(c);}var args = [1,2];// rs2(...args);
*******************************************/*2、generator函数,控制函数的执行过程,手工暂停和恢复代码的执行,只支持ES6*/function* doThing(){ console.log("start"); yield; console.log("finish");}var func = doThing();func.next();func.next();
*******************************************编译出js为:function doThing() {return __generator(this, function (_a) {switch (_a.label) {case 0:console.log("start");return [4 /*yield*/];case 1:_a.sent();console.log("finish");return [2 /*return*/];}});}var func = doThing();func.next();func.next();
*******************************************/*3、destructuring析构表达式,是通过表达式将对象或数组进行拆解成任意数量的变量*/function getStock(){ //返回一个对象 return { nameVal:'xuchg', ageVal:23 }}//以下为js中的写法,以作对比var stock = getStock();var name1 = stock.nameVal;var age1 = stock.ageVal;//typescript的写法var {nameVal,ageVal} = getStock();console.log(nameVal);console.log(ageVal);//析构表达式接受的变量名必须和返回对象的变量名相同//析构表达式从数组中取值var arr = [1,2,4];var [num1,num2,...otherNum] = arr;console.log(num1);console.log(num2);console.log(otherNum);//用在方法上function doSomeThing([num1,num2,...otherNum]){ console.log(num1); console.log(otherNum);}doSomeThing(arr);//拆分参数变量
*******************************************编译出js为:function getStock() {//返回一个对象return {nameVal: 'xuchg',ageVal: 23};}//以下为js中的写法,以作对比var stock = getStock();var name1 = stock.nameVal;var age1 = stock.ageVal;//typescript的写法var _b = getStock(), nameVal = _b.nameVal, ageVal = _b.ageVal;console.log(nameVal);console.log(ageVal);//析构表达式接受的变量名必须和返回对象的变量名相同//析构表达式从数组中取值var arr = [1, 2, 4];var num1 = arr[0], num2 = arr[1], otherNum = arr.slice(2);console.log(num1);console.log(num2);console.log(otherNum);//用在方法上function doSomeThing(_a) {var num1 = _a[0], num2 = _a[1], otherNum = _a.slice(2);console.log(num1);console.log(otherNum);}doSomeThing(arr); //拆分参数变量var _a;
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