我有以下js输入,一个json对象数组selectSpec
var selectSpec = [
{
attr: [{ 'memory': 20 }],
attrValues:[
{ attrValueName: '16G', attrValueId: 21 },
{ attrValueName: '32G', attrValueId: 22 }
]
},
{
attr: [{ 'color': 27 }],attrValues:
[
{ attrValueName: 'white', attrValueId: 23 },
{ attrValueName: 'black', attrValueId: 34 }
]
}
];
我需要输出以下数据,
var selectResult = [
[
{ attrId: 20, attrValueId: 21, attrValueName: '16G' },
{ attrId: 27, attrValueId: 23, attrValueName: 'white' }
],
[
{ attrId: 20, attrValueId: 21, attrValueName: '16G' },
{ attrId: 27, attrValueId: 34, attrValueName: 'black' }
],
[
{ attrId: 20, attrValueId: 22, attrValueName: '32G' },
{ attrId: 27, attrValueId: 23, attrValueName: 'black' }
],
[
{ attrId: 20, attrValueId: 22, attrValueName: '32G' },
{ attrId: 27, attrValueId: 34, attrValueName: 'white' }
]
];
我尝试使用笛卡尔积,但最后,它仍然存在一些问题,我不知道如何实现它。提前谢谢。
答案 0 :(得分:3)
您可以为每个for
创建递归函数和内部使用attrValues
循环,并为数组中的每个对象增加一个值。
var selectSpec = [{"attr":[{"memory":20}],"attrValues":[{"attrValueName":"16G","attrValueId":21},{"attrValueName":"32G","attrValueId":22}]},{"attr":[{"color":27}],"attrValues":[{"attrValueName":"white","attrValueId":23},{"attrValueName":"black","attrValueId":34}]}];
function cartesian(data) {
var r = [];
function generate(data, n, c) {
if (n == data.length) {
return r.push(c.slice());
}
var value = data[n].attr[0][Object.keys(data[n].attr[0])[0]]
for (var i = 0; i < data[n].attrValues.length; i++) {
c[n] = Object.assign({}, {
attrId: value
}, data[n].attrValues[i])
generate(data, n + 1, c);
}
}
generate(data, 0, []);
return r;
}
console.log(JSON.stringify(cartesian(selectSpec), 0, 4))
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