js按长度截取字符串 返回按长度分割成的字符串数组

var str = "春节快要放假了，好开心呀！"var strArr = [];var n = 3;for (var i = 0, l = str.length; i < l/n; i++) {var a = str.slice(n*i, n*(i+1));strArr.push(a);}console.log(strArr);结果：["春节快", "要放假", "了，好", "开心呀", "！"]