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爲什麼sum是undefined。我究竟做錯了什麼？不返回對象值之和的遞歸函數
var testData1 = [{
"name": "Doctors",
"category": "Doctors",
"subCategory": [{
"name": "Likes",
"category": "Likes",
"subCategory": [{
"name": "Visit",
"category": "Visit",
"subCategory": [{
"name": "Charges",
"category": "Charges",
"subCategory": null,
"val": 30
}]
}]
}, {
"name": "Dislikes",
"category": "Dislikes",
"subCategory": [{
"name": "Quality",
"category": "Quality",
"subCategory": [{
"name": "Appointment",
"category": "Appointment",
"subCategory": null,
"val": 50
}, {
"name": "Care",
"category": "Care",
"subCategory": null,
"val": 70
}, {
"name": "Attentive ",
"category": "Attentive ",
"subCategory": null,
"val": 90
}]
}]
}, {
"name": "Neutral",
"category": "Neutral",
"subCategory": [{
"name": "Professional ",
"category": "Professional ",
"subCategory": [{
"name": "Ease",
"category": "Ease",
"subCategory": null,
"val": 50
}, {
"name": "Competent ",
"category": "Competent ",
"subCategory": null,
"val": 40
}, {
"name": "Availability",
"category": "Availability",
"subCategory": null,
"val": 80
}]
}]
}],
"index": 6
}, {
"name": "Service",
"category": "Service",
"subCategory": [{
"name": "Likes",
"category": "Likes",
"subCategory": [{
"name": "Environment",
"category": "Environment",
"subCategory": [{
"name": "Professionalism ",
"category": "Professionalism ",
"subCategory": null,
"val": 50
}, {
"name": "Room",
"category": "Room",
"subCategory": null,
"val": 30
}, {
"name": "Parking",
"category": "Parking",
"subCategory": null,
"val": 20
}]
}, {
"name": "Availability",
"category": "Availability",
"subCategory": [{
"name": "Competent ",
"category": "Competent ",
"subCategory": null,
"val": 30
}]
}]
}, {
"name": "Dislikes",
"category": "Dislikes",
"subCategory": [{
"name": "Management",
"category": "Management",
"subCategory": [{
"name": "Staff",
"category": "Staff",
"subCategory": null,
"val": 50
}, {
"name": "Operations",
"category": "Operations",
"subCategory": null,
"val": 70
}]
}, {
"name": "Nurses",
"category": "Nurses",
"subCategory": [{
"name": "Medicine",
"category": "Medicine",
"subCategory": null,
"val": 30
}]
}]
}, {
"name": "Neutral",
"category": "Neutral",
"subCategory": [{
"name": "Serving",
"category": "Serving",
"subCategory": [{
"name": "Took long time",
"category": "Took long time",
"subCategory": null,
"val": 50
}, {
"name": "Rude",
"category": "Rude",
"subCategory": null,
"val": 40
}, {
"name": "Seated",
"category": "Seated",
"subCategory": null,
"val": 80
}]
}]
}],
"index": 16
}];
function addSum(data) {
data.forEach(function(d, index) {
if (Array.isArray(d.subCategory)) {
return (0 + addSum(d.subCategory));
} else {
document.write('<pre>' + JSON.stringify(d.val, 0, 4) + '</pre>');
return d.val;
}
});
}
var sum = addSum(testData1);
alert(sum);