The style guidelines and best practices for our engineering team.

Javascript Styles

2 spaces – for indentation
No unused variables – this one catches tons of bugs!
No semicolons – It's fine. Really!
Never start a line with ( , [ , or ```
Space after keywords if (condition) { ... }
Always use === instead of == – but obj == null is allowed to check null || undefined .

编译错误集

Question	Answer
错误: 不兼容的类型: String无法转换为int int xueHao = "110";	int xueHao = 110;
错误: 找不到符号 int xingMing = 张三;	int 张三 = 100; int xingMing = 张三;
错误: 不兼容的类型: String无法转换为int int xingMing = "张三";	String xingMing = "张三";
错误: 不兼容的类型: String无法转换为char char c4 = "a";	char c4 = ‘a’;
错误: 未结束的字符文字 char c5 = 'ab';	char c5 = 'a';
错误: 未结束的字符文字 System.out.println('');	System.out.println('\');
错误: 空字符文字 System.out.println(''');	System.out.println(’’’);
错误: 需要')' System.out.println(""YUNKECANG"");	错误: 需要')' System.out.println(""YUNKECANG"");
错误: 整数太大 long e = 2147483648;	错误: 整数太大 long e = 2147483648L;
错误: 不兼容的类型: 从long转换到int可能会有损失 long x = 100; int y = x;	long x = 100; int y = int(x);
错误: 不兼容的类型: 从int转换到short可能会有损失char c1 = 'a'; byte b = 1; short c = c1 + b;	char c1 = 'a'; byte b = 1; short c = (short)(c1 + b);
错误: 不兼容的类型: 从double转换到float可能会有损失 float f = 3.14;	float f = 3.14F;或者float f = (float)3.14;
错误: 不兼容的类型: 从double转换到int可能会有损失 int i = 10.0 / 5;	int i = (int)10.0 / 5;或者int i = (int)(10.0 / 5);
错误: 不兼容的类型: int无法转换为boolean boolean xingBie = 1;	boolean xingBie = true;