AIWROK软件展示JavaScript各种语句标识符的用法
AIWROK软件展示JavaScript各种语句标识符的用法
// JavaScript语句标识符详细示例
// AIWROK软件 - 展示JavaScript各种语句标识符的用法
// 🍎交流QQ群711841924群一，苹果内测群，528816639
// 1. var - 声明变量
function printl() {
var args = Array.prototype.slice.call(arguments);
console.log.apply(console, args);
}
var globalVariable = "我是全局变量";
var numberVar = 42;
var booleanVar = true;
var arrayVar = ;
var objectVar = {name: "张三", age: 25, city: "北京"};
function demonstrateVar() {
var functionVariable = "我是函数内变量";
printl("var语句示例:");
print.log("var语句示例:");
printl("全局变量:", globalVariable);
print.log("全局变量:", globalVariable);
printl("函数内变量:", functionVariable);
print.log("函数内变量:", functionVariable);
}
// 2. function - 定义函数
function calculateSum(a, b) {
return a + b; // return语句 - 退出函数
}
function demonstrateFunction() {
printl("\nfunction语句示例:");
print.log("\nfunction语句示例:");
var result = calculateSum(10, 20);
printl("10 + 20 =", result);
print.log("10 + 20 =", result);
}
// 3. if...else - 条件语句
function demonstrateIfElse() {
printl("\nif...else语句示例:");
print.log("\nif...else语句示例:");
var age = 20;
var score = 85;
if (age >= 18) {
printl("成年人");
print.log("成年人");
} else {
printl("未成年人");
print.log("未成年人");
}
if (score >= 90) {
printl("优秀");
print.log("优秀");
} else if (score >= 80) {
printl("良好");
print.log("良好");
} else if (score >= 60) {
printl("及格");
print.log("及格");
} else {
printl("不及格");
print.log("不及格");
}
}
// 4. while - 循环语句
function demonstrateWhile() {
printl("\nwhile语句示例:");
print.log("\nwhile语句示例:");
var i = 0;
printl("while循环输出1-5:");
print.log("while循环输出1-5:");
while (i < 5) {
printl(i + 1);
print.log(i + 1);
i++;
}
}
// 5. do...while - 循环语句
function demonstrateDoWhile() {
printl("\ndo...while语句示例:");
print.log("\ndo...while语句示例:");
var j = 0;
printl("do...while循环输出1-3:");
print.log("do...while循环输出1-3:");
do {
printl(j + 1);
print.log(j + 1);
j++;
} while (j < 3);
}
// 6. for - 循环语句
function demonstrateFor() {
printl("\nfor语句示例:");
print.log("\nfor语句示例:");
printl("for循环输出数组元素:");
print.log("for循环输出数组元素:");
for (var i = 0; i < arrayVar.length; i++) {
printl("数组第", i + 1, "个元素:", arrayVar);
print.log("数组第", i + 1, "个元素:", arrayVar);
}
}
// 7. for...in - 遍历对象属性
function demonstrateForIn() {
printl("\nfor...in语句示例:");
print.log("\nfor...in语句示例:");
printl("遍历对象属性:");
print.log("遍历对象属性:");
for (var key in objectVar) {
printl(key + ":", objectVar);
print.log(key + ":", objectVar);
}
}
// 8. break - 跳出循环
function demonstrateBreak() {
printl("\nbreak语句示例:");
print.log("\nbreak语句示例:");
printl("遇到3时跳出循环:");
print.log("遇到3时跳出循环:");
for (var i = 1; i <= 5; i++) {
if (i === 3) {
printl("遇到数字3，跳出循环");
print.log("遇到数字3，跳出循环");
break; // 跳出循环
}
printl("当前数字:", i);
print.log("当前数字:", i);
}
}
// 9. continue - 跳过当前迭代
function demonstrateContinue() {
printl("\ncontinue语句示例:");
print.log("\ncontinue语句示例:");
printl("跳过偶数，只输出奇数:");
print.log("跳过偶数，只输出奇数:");
for (var i = 1; i <= 5; i++) {
if (i % 2 === 0) {
printl("跳过偶数:", i);
print.log("跳过偶数:", i);
continue; // 跳过当前迭代
}
printl("奇数:", i);
print.log("奇数:", i);
}
}
// 10. switch - 多重选择
function demonstrateSwitch() {
printl("\nswitch语句示例:");
print.log("\nswitch语句示例:");
var day = 3;
var dayName;
switch (day) {
case 1:
dayName = "星期一";
break;
case 2:
dayName = "星期二";
break;
case 3:
dayName = "星期三";
break;
case 4:
dayName = "星期四";
break;
case 5:
dayName = "星期五";
break;
case 6:
case 7:
dayName = "周末";
break;
default:
dayName = "未知";
}
printl("今天是:", dayName);
print.log("今天是:", dayName);
}
// 11. try...catch - 错误处理
function demonstrateTryCatch() {
printl("\ntry...catch语句示例:");
print.log("\ntry...catch语句示例:");
try {
// 故意制造错误
var undefinedVar = someUndefinedVariable;
printl("这行不会执行");
print.log("这行不会执行");
} catch (error) {
printl("捕获到错误:", error.message);
print.log("捕获到错误:", error.message);
} finally {
printl("try...catch语句执行完毕");
print.log("try...catch语句执行完毕");
}
try {
// 正确的代码
var result = calculateSum(5, 10);
printl("计算成功:", result);
print.log("计算成功:", result);
} catch (error) {
printl("捕获到错误:", error.message);
print.log("捕获到错误:", error.message);
}
}
// 12. throw - 抛出错误
function demonstrateThrow() {
printl("\nthrow语句示例:");
print.log("\nthrow语句示例:");
function validateAge(age) {
if (age < 0) {
throw new Error("年龄不能为负数");
} else if (age > 150) {
throw new Error("年龄不能超过150岁");
} else if (typeof age !== "number") {
throw new Error("年龄必须是数字");
}
return true;
}
try {
validateAge(25);
printl("年龄验证通过: 25");
print.log("年龄验证通过: 25");
} catch (error) {
printl("验证失败:", error.message);
print.log("验证失败:", error.message);
}
try {
validateAge(-5);
printl("这行不会执行");
print.log("这行不会执行");
} catch (error) {
printl("验证失败:", error.message);
print.log("验证失败:", error.message);
}
}
// 员工绩效评估系统 - 综合示例
function employeePerformanceEvaluation() {
printl("\n=== 员工绩效评估系统 ===");
print.log("\n=== 员工绩效评估系统 ===");
var employees = [
{name: "张三", score: 95, projects: 8, teamwork: 90},
{name: "李四", score: 78, projects: 5, teamwork: 85},
{name: "王五", score: 45, projects: 2, teamwork: 40},
{name: "赵六", score: 88, projects: 7, teamwork: 92}
];
var totalEmployees = employees.length;
var excellentCount = 0;
var goodCount = 0;
var averageCount = 0;
var poorCount = 0;
// 使用for循环遍历员工
for (var i = 0; i < totalEmployees; i++) {
var employee = employees;
var performance;
// 使用if...else判断绩效等级
if (employee.score >= 90 && employee.projects >= 6) {
performance = "优秀";
excellentCount++;
} else if (employee.score >= 80) {
performance = "良好";
goodCount++;
} else if (employee.score >= 60) {
performance = "合格";
averageCount++;
} else {
performance = "需要改进";
poorCount++;
}
printl(employee.name + " - 绩效:" + performance +
" (得分:" + employee.score + ", 项目:" + employee.projects +
", 团队合作:" + employee.teamwork + ")");
print.log(employee.name + " - 绩效:" + performance +
" (得分:" + employee.score + ", 项目:" + employee.projects +
", 团队合作:" + employee.teamwork + ")");
// 使用continue跳过特定条件的员工
if (employee.projects < 3) {
printl("-> 项目经验不足，跳过详细评估");
print.log("-> 项目经验不足，跳过详细评估");
continue;
}
// 使用switch进行详细评估
switch (performance) {
case "优秀":
printl("-> 建议晋升或加薪");
print.log("-> 建议晋升或加薪");
printl("-> 承担更多项目领导责任");
print.log("-> 承担更多项目领导责任");
break;
case "良好":
printl("-> 继续当前工作表现");
print.log("-> 继续当前工作表现");
printl("-> 可考虑技能培训");
print.log("-> 可考虑技能培训");
break;
case "合格":
printl("-> 需要改进工作质量");
print.log("-> 需要改进工作质量");
printl("-> 建议参加技能提升课程");
print.log("-> 建议参加技能提升课程");
break;
case "需要改进":
printl("-> 需要制定改进计划");
print.log("-> 需要制定改进计划");
printl("-> 考虑岗位调整");
print.log("-> 考虑岗位调整");
break;
}
}
// 使用while循环进行统计
printl("\n绩效统计:");
print.log("\n绩效统计:");
var categories = ["优秀", "良好", "合格", "需要改进"];
var counts = ;
var k = 0;
while (k < categories.length) {
printl(categories + ":" + counts + "人");
print.log(categories + ":" + counts + "人");
k++;
}
// 使用do...while计算平均分
var sum = 0;
var l = 0;
do {
sum += employees.score;
l++;
} while (l < employees.length);
var average = sum / employees.length;
printl("\n平均绩效得分:" + average.toFixed(2));
print.log("\n平均绩效得分:" + average.toFixed(2));
}
// 空格和码行折行示例
function demonstrateSpacingAndLineBreaks() {
printl("\n=== 空格和码行折行示例 ===");
print.log("\n=== 空格和码行折行示例 ===");
// 正确的空格使用
var person1 = "runoob";
var person2 = "runoob"; // 这两种写法都正确
printl("空格使用示例:");
print.log("空格使用示例:");
printl("person1:", person1);
print.log("person1:", person1);
printl("person2:", person2);
print.log("person2:", person2);
// 码行折行 - 使用反斜杠
printl("码行折行示例:");
print.log("码行折行示例:");
printl("你好 \
世界!");
print.log("你好 \
世界!");
// 更好的折行方式（推荐）
printl("推荐的多行字符串写法:");
print.log("推荐的多行字符串写法:");
printl("你好" +
"世界!" +
"欢迎学习JavaScript");
print.log("你好" +
"世界!" +
"欢迎学习JavaScript");
}
// 代码注释示例
function demonstrateComments() {
printl("\n=== 代码注释示例 ===");
print.log("\n=== 代码注释示例 ===");
// 单行注释 - 这是单行注释
var singleComment = "这是单行注释示例";
printl(singleComment);
print.log(singleComment);
/*
* 多行注释示例
* 这里可以写很多注释内容
* 用于说明复杂的代码逻辑
* AIWROK软件
*/
var multiLineComment = "这是多行注释示例";
printl(multiLineComment);
print.log(multiLineComment);
/**
* JSDoc风格的多行注释
* @param {number} a 第一个数字
* @param {number} b 第二个数字
* @returns {number} 两个数字的和
*/
function addNumbers(a, b) {
return a + b;
}
var sum = addNumbers(5, 10);
printl("函数注释示例 - 5 + 10 =", sum);
print.log("函数注释示例 - 5 + 10 =", sum);
}
// 主函数 - 演示所有语句标识符
function demonstrateAllStatements() {
printl("=== JavaScript语句标识符完整示例 ===");
print.log("=== JavaScript语句标识符完整示例 ===");
printl("AIWROK软件 - 深入理解JavaScript语句标识符\n");
print.log("AIWROK软件 - 深入理解JavaScript语句标识符\n");
demonstrateVar();
demonstrateFunction();
demonstrateIfElse();
demonstrateWhile();
demonstrateDoWhile();
demonstrateFor();
demonstrateForIn();
demonstrateBreak();
demonstrateContinue();
demonstrateSwitch();
demonstrateTryCatch();
demonstrateThrow();
employeePerformanceEvaluation();
demonstrateSpacingAndLineBreaks();
demonstrateComments();
}
// 执行所有演示
demonstrateAllStatements();
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