Javascript 如何对json数组求和
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How to sum json array
提问by Louis
How can I to sum elements of a JSON array like this, using jQuery:
如何使用 jQuery 对这样的 JSON 数组的元素求和：
"taxes": [ { "amount": 25, "currencyCode": "USD", "decimalPlaces": 0,"taxCode": "YRI",
{ "amount": 25, "currencyCode": "USD", "decimalPlaces": 0,"taxCode": "YRI",
{ "amount": 10, "currencyCode": "USD", "decimalPlaces": 0,"taxCode": "YRI",}],
The result should be:
结果应该是：
totalTaxes = 60
totalTaxes = 60
回答by epascarello
Working with JSON 101
使用 JSON 101
var foo = {
taxes: [
{ amount: 25, currencyCode: "USD", decimalPlaces: 0, taxCode: "YRI"},
{ amount: 25, currencyCode: "USD", decimalPlaces: 0, taxCode: "YRI"},
{ amount: 10, currencyCode: "USD", decimalPlaces: 0, taxCode: "YRI"}
]
},
total = 0, //set a variable that holds our total
taxes = foo.taxes, //reference the element in the "JSON" aka object literal we want
i;
for (i = 0; i < taxes.length; i++) { //loop through the array
total += taxes[i].amount; //Do the math!
}
console.log(total); //display the result
回答by Ates Goral
If you really mustuse jQuery, you can do this:
如果你真的必须使用 jQuery，你可以这样做：
var totalTaxes = 0;
$.each(taxes, function () {
totalTaxes += this.amount;
});
Or you can use the ES5 reducefunction, in browsers that support it:
或者您可以reduce在支持它的浏览器中使用 ES5功能：
totalTaxes = taxes.reduce(function (sum, tax) {
return sum + tax.amount;
}, 0);
Or simply use a for loop like in @epascarello's answer...
或者简单地使用像@epascarello's answer中的for循环......
