我有一些
JSON数据：
{"humans": [
{ "firstName" : "Paul","lastName" : "Taylor","hairs": 2 },{ "firstName" : "Sharon","lastName" : "Mohan","hairs": 3 },{ "firstName" : "Mohan","lastName" : "Harris",{ "firstName" : "Deborah","lastName" : "Goldman","hairs": 4 },{ "firstName" : "Mark","lastName" : "Young",{ "firstName" : "Tom","lastName" : "Perez","hairs": 4 }
//and so on...
]}
我希望能够计算所有拥有2根头发,3根头发等的人.现在我正在使用jQuery.each()加上递增计数数组,它可以正常工作.
但我想知道是否有更简单的方法来做到这一点.
更新：
附加代码说明我现在在做什么：
var results = eval(data.humans);
var count_array = [0,0];
$(results).each(function() {
if (this.hairs == 1) {
count_array[0]++;
}
if (this.hairs == 2) {
count_array[1]++
}
if (this.hairs == 3) {
count_array[2]++
}
if (this.hairs == 4) {
count_array[3]++
}
if (this.hairs == 5) {
count_array[4]++
}
if (this.hairs == 6) {
count_array[5]++
}
if (this.hairs == 7) {
count_array[6]++
}
});
解决方法
您可以使用
filter function过滤对象数组：
var data = {...}
data.humans.filter(function(o) { return o.hairs == 2 }).length
//Return the number of humans who have 2 hairs
看看fiddle
