JavaScript基础语法（流程控制语句）
学习路线：JavaScript基础语法（输出语句）->JavaScript基础语法（变量）->JavaScript基础语法（数据类型）->JavaScript基础语法（运算符）->JavaScript基础语法（流程控制语句）->JavaScript基础语法（类型转换）->JavaScript基础语法（函数）->Array_JavaScript->String_JavaScript->自定义对象_JavaScript->JavaScript_BOM->Window对象->confirm()、setInterval()、setTimeout()->History、Location->闪烁的灯泡->JavaScript_DOM->事件绑定(onclick,onfocus,onblur)->
事件绑定(onmouseout,onmouseover)
->事件绑定(onsubmit)表单提交
->提交表单与验证表单案例
简介：JavaScript 中提供了和 Java 一样的流程控制语句，如下
if 语句
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <script> var cnt = 3; if (cnt == 3) { document.write(count); } </script> </body> </html>
switch 语句
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <script> var num = 3; switch (num) { case 1: alert("星期一"); break; case 2: alert("星期二"); break; case 3: alert("星期三"); break; case 4: alert("星期四"); break; case 5: alert("星期五"); break; case 6: alert("星期六"); break; case 7: alert("星期日"); break; default: alert("输入的星期有误"); break; } </script> </body> </html>
for 循环语句
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <script> var str = "abc" for(var i = 0; i < str.length; ++ i){ console.log(str.charAt(i)) } </script> </body> </html>
while 循环语句
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <script> var sum = 0; var i = 1; while (i <= 100) { sum += i; i++; } </script> </body> </html>
dowhile 循环语句
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <script> var sum = 0; var i = 1; do { sum += i; i++; } while (i <= 100); </script> </body> </html>
