C# 字符串格式

Debug.Log(123.ToString("000000")); //output:000123
Debug.Log(255.ToString("X")); // output: FF

Debug.Log(Mathf.PI.ToString());	   // output: 3.141593
Debug.Log(Mathf.PI.ToString("F")); // output: 3.14
Debug.Log(Mathf.PI.ToString("F3")); // output: 3.142
Debug.Log(Mathf.PI.ToString("E")); // output: 3.141593E+000

var v2=new Vector2(0.123456789f,0.123456789f);
Debug.Log(v2);				 // output: (0.1, 0.1)
Debug.Log(v2.ToString("G")); // output: (0.1234568, 0.1234568)

更多格式说明：
https://docs.microsoft.com/zh-cn/dotnet/standard/base-types/standard-numeric-format-strings