我希望有人可以指出我正确的方向，我已经花了几个小时试图解决我认为是一个简单的问题 - 我已经搜索过并尝试了各种接近但没有雪茄的东西。
我想从下面的示例JSON块中计算两件事。
首先，我想计算productLine条目的数量，然后我想计算类型的数量 - 按产品线计算所有productLine的总数。
所以我想最终得到3个变量，并为它们分配一个数字来表示这三个值。
有人能帮忙吗？
var products = {
"product": "Product Name",
"productLines": [{
"productLine": "Line 1",
"types": ["Type 1", "Type 2", "Type 3", "Type 4"]
}, {
"productLine": "Line 2",
"types": ["Type 5", "Type 6", "Type 7", "Type 8"]
}, {
"productLine": "Line 3",
"types": ["Type 9", "Type 10", "Type 11"]
}, {
"productLine": "Line 4",
"types": ["Type 12", "Type 13"]
}]
};
输出类似于：
var productLineCount = 4
var productLine[0].name = "Line 1"
var productLine[0].types.count() = 4
var typesCount = 13
答案 0 :(得分：1)
你可以通过，
来做到# Virtual Hosts
#
# Required modules: mod_log_config
# If you want to maintain multiple domains/hostnames on your
# machine you can setup VirtualHost containers for them. Most configurations
# use only name-based virtual hosts so the server doesn't need to worry about
# IP addresses. This is indicated by the asterisks in the directives below.
#
# Please see the documentation at
# <URL:http://httpd.apache.org/docs/2.4/vhosts/>
# for further details before you try to setup virtual hosts.
#
# You may use the command line option '-S' to verify your virtual host
# configuration.
#
# VirtualHost example:
# Almost any Apache directive may go into a VirtualHost container.
# The first VirtualHost section is used for all requests that do not
# match a ServerName or ServerAlias in any <VirtualHost> block.
#
<VirtualHost *:80>
ServerAdmin admin@apecenergy
DocumentRoot /var/www/html/apecenergy.co.uk/public_html
ServerName www.apecenergy.co.uk
ServerAlias apecenergy.co.uk
ErrorLog "/var/log/httpd/apecenergy-error_log"
CustomLog "/var/log/httpd/apecenergy-access_log" common
</VirtualHost>
<VirtualHost *:80>
ServerAdmin admin@apecenergy
DocumentRoot /var/www/html/plumbing_sites/crouchendplumber.co.uk/public_html
ServerName www.crouchendplumber.co.uk
ServerAlias crouchendplumber.co.uk
</VirtualHost>
第一个是显而易见的，即读取数组的长度。但第二个可以使用winpcap完成。它可以通过多种方式完成。但我建议你在这种背景下使用reduce。
答案 1 :(得分：1)
您可以使用forEach循环并将结果返回到一个对象
var products = {
"product": "Product Name",
"productLines": [{
"productLine": "Line 1",
"types": ["Type 1", "Type 2", "Type 3", "Type 4"]
}, {
"productLine": "Line 2",
"types": ["Type 5", "Type 6", "Type 7", "Type 8"]
}, {
"productLine": "Line 3",
"types": ["Type 9", "Type 10", "Type 11"]
}, {
"productLine": "Line 4",
"types": ["Type 12", "Type 13"]
}]
};
var result = {}
products.productLines.forEach(function(e) {
result.totalLines = (result.totalLines || 0) + 1;
e.types.forEach(function(a) {
result.totalTypes = (result.totalTypes || 0) + 1;
result[e.productLine + 'Types'] = (result[e.productLine + 'Types'] || 0) + 1;
});
});
document.body.innerHTML = '<pre>' + JSON.stringify(result, 0, 4) + '</pre>';
答案 2 :(得分：1)
您可以使用自定义API
getter(index, type)
index是产品索引，类型可以是typeCount或name。
var products = {
"product": "Product Name",
"productLines": [{
"productLine": "Line 1",
"types": ["Type 1", "Type 2", "Type 3", "Type 4"]
}, {
"productLine": "Line 2",
"types": ["Type 5", "Type 6", "Type 7", "Type 8"]
}, {
"productLine": "Line 3",
"types": ["Type 9", "Type 10", "Type 11"]
}, {
"productLine": "Line 4",
"types": ["Type 12", "Type 13"]
}]
};
var count = 0;
for (var i = 0, len = products.productLines.length; i < len; i += 1) {
count += products.productLines[i].types.length;
}
console.log('productLineCount: ',len);
console.log('typesCount: ', count);
function getter(index, type) {
var res,
arr = products.productLines[index];
if (type === 'name') {
res = arr.productLine;
}
else if (type === 'typeCount') {
res = arr.types.length;
}
return res;
}
console.log('productLine[0].name: ', getter(0, 'name'));
console.log('productLine[0].types.count(): ', getter(0, 'typeCount'));
/*console.log('productLine[1].name: ', getter(1, 'name'));
console.log('productLine[1].types.count(): ', getter(1, 'typeCount'));
console.log('productLine[2].name: ', getter(2, 'name'));
console.log('productLine[2].types.count(): ', getter(2, 'typeCount'));*/
答案 3 :(得分：0)
您可以按如下方式获得三项计数：
var products = {
"product": "Product Name",
"productLines": [{
"productLine": "Line 1",
"types": ["Type 1", "Type 2", "Type 3", "Type 4"]
}, {
"productLine": "Line 2",
"types": ["Type 5", "Type 6", "Type 7", "Type 8"]
}, {
"productLine": "Line 3",
"types": ["Type 9", "Type 10", "Type 11"]
}, {
"productLine": "Line 4",
"types": ["Type 12", "Type 13"]
}]
};
var productLineCount = products.productLines.length;
var productTypesCount = products.productLines.map(line => line.types.length);
var totalTypesCount = productTypesCount.reduce((sum, cur) => sum + cur, 0);
console.log('productLineCount', productLineCount);
console.log('productTypesCount', productTypesCount);
console.log('totalTypesCount', totalTypesCount);
PROFILE_HOME/config/cells/cell/applications/isclite.ear/deployments/isclite/deployment.xml
答案 4 :(得分：0)
为了计算ProductLines，您可以这样做
number_of_productLines = products.productLines.length
按照productLines计算类型，你可以这样做：
productlines_types_count = [] # List of {'productline': name, 'length': int}
products.productLines.forEach(function(productline){
productlines_types_count.push({'productline': productline.productLine, 'length': productline.types.length})
});
同样修复你的json，最后一个对象有一个＆＃39;类型＆＃39;我喜欢＆＃39;类型＆＃39;：
var products =
{
"product" : "Product Name",
"productLines": [
{
"productLine" : "Line 1",
"types": ["Type 1", "Type 2", "Type 3", "Type 4"]
},
{
"productLine": "Line 2",
"types": ["Type 5", "Type 6", "Type 7", "Type 8"]
},
{
"productLine": "Line 3",
"types": ["Type 9", "Type 10", "Type 11"]
},
{
"productLine": "Line 4",
"types": ["Type 12", "Type 13"] #here
}]
};