javascript - 添加值数组

Question

这是我拥有的 json 数据

{
"data" : 
    {
        "Count" : ["1","2","3","4", "5"]

    }

}

我如何使用 jQuery 来获得结果

"Result" : ["1", "3","6","10", "15"]

Answer 1

如果您可以使用 ECMAScript 5 Array 方法：假设json是您的 json 数据...

var sum = 0,
    count = JSON.parse(json).data.Count.map(function(i) {
      return parseInt(i, 10) + sum;
    });

Answer 2

var myArray = [];
var data = myArray.data
for ( var i = 0; i < data.length; i = i + 1 ) {
   val = i == 0 ? 0 : myArray[i-1]
   myArray.push(data[i]+val)    
}
console.log(myArray)

Answer 3

除非数据是 DOM 对象的一部分，否则我看不到使用 jQuery 的意义。

var myData = 
{
"data" : 
    {
        "Count" : ["1","2","3","4", "5"]
    }
}
var countAry = myData.data.Count;
var results = new Array(countAry.length);


for (var i = 0, il = countAry.length; i < il; i++) {
    results[i] = Number(countAry[i]) + (results[i - 1] || 0);
}

myData.data.Results = results;
console.log(myData);

Answer 4

不需要 jQuery，一个原始循环就可以做到这一点：

// Either
var obj = {"data":{"Count":["1","2","3","4","5"]}}
// or
var obj = JSON.parse(jsonString);

var arr = obj.data.Count,
    res = [],
    acc = 0;
for (var i=0; i<arr.length; i++)
    res[i] = String(acc += Number(arr[i]));
obj.data.Result = res;

或者，如果您只想将计数添加到之前的（单个）计数中，请使用

for (var i=0; i<arr.length; i++)
    res[i] = String(+arr[i] + (i && +arr[i-1]));