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记录一下最近工作中用到的 const str = ""; const bool = true; const num = 10; const nul = null; const und = undefined; const arr = new Array(6); const fun = ()=>{console.log(arr);}; const obj = new Object(); console.log("------以下是是基础数据类型------") console.log(Object.

用于echarts图 (function(){ let y = new Date().getFullYear(),s = 0,d = []; for(let i = 0;i<12;i++){ s += new Date(y,i,0).getDate(); for(let v = 0;v < new Date(y,i+1,0).getDate();v++){