js 数组array 对象 小数点后2位 toFixed() 替换 二维数组 替换键值答: obj = { c: { aa: [1, 2, 3, 4],bb: [1.1, 2.2, 3.3],cc: [1.11, 2.22, 3.33]} };let {c: {aa}, c: {bb}, c: {cc}} = obj;let foo = fn => { if (Array.isArray(fn)) { for (let i = 0; i < fn.length; i++) { foo(fn[i]);} }else...
JS中,怎样用for..in来输出二维数组?答:var week=[["周一","周二","周三","周四","周五","周六","周日"],["吃饭","睡觉","学习"]]for (var i = 0; i < week.length; i++) { for (var j = 0; j < week[i].length; j++) { document.write(week[i][j]+"")} } ...