jQuery清除数组中的空值

• var aa = ["12", "34", "", "423", " "];
• console.log($.grep(aa, function(n) {return $.trim(n).length > 0;}))
• var aaa = aa.filter(s => $.trim(s).length > 0);
• console.log(aaa);
• 结果：["12", "34", "423"]
• ["12", "34", "423"]