多维json 获取 属性值

function getPropertyValue(obj, propertyPath) {

const properties = propertyPath.split('.');

for (let i = 0; i < properties.length; i++) {

console.log("start", properties[i]);

if (obj && typeof obj === 'object' && properties[i] in obj) {

// obj = obj[properties[i]];

obj = Reflect.get(obj, properties[i])

console.log("ok");

} else {

console.log("err");

return undefined;

}

console.log("end");

}

return obj;

}