摘要：1,将NodeList 转化成 Arrayvar divs = Array.from(document.querySelectorAll('div'));2,将 arguments 转化成 Arrayfunction something() { var args = Array.from(argum 阅读全文

摘要：确保有loc:[longitude, latitude]属性给loc增加索引AttractionSchema.index({loc: '2d'});使用geoNeardb.places.find( { location: { $nearSphere: { $geometry: { type : "P 阅读全文

摘要：function bubbleSort3(arr3) { var low = 0; var high= arr.length-1; //设置变量的初始值 var tmp,j; console.time('2.改进后冒泡排序耗时'); while (low < high) { for (j= low; 阅读全文

摘要：db.inventory.aggregate( [{$unwind: "$sizes"},{$group:{"}} ] ) sudo iptables -L -nservice iptables statusservice iptables start $project: { items: { $f 阅读全文