时间单位换算

{"s":{"label":"秒","symbol":"s","factor":1},"ms":{"label":"毫秒","symbol":"ms","factor":0.001},"us":{"label":"微秒","symbol":"μs","factor":1.0e-6},"min":{"label":"分","symbol":"min","factor":60},"h":{"label":"时","symbol":"h","factor":3600},"d":{"label":"天","symbol":"d","factor":86400},"wk":{"label":"周","symbol":"wk","factor":604800},"mon":{"label":"月（30天）","symbol":"mon","factor":2592000},"yr":{"label":"年（365天）","symbol":"yr","factor":31536000}}