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项目中变量命名，采用数据类型显式声明的方式
- fn => function
- b => boolean
- s => string
- n => number
- a => array
- o => object
// 示例 let fnFoo = function() {}; let bFlag = false; let sMessage = 'hello world'; let nCount = 0; let aTodoList = []; let oTodo = { text: '', start_time: 1536627800131 };