添加对象数组中包含的值

Adding values contained in an array of objects

本文关键字：包含 对象 数组 添加      更新时间：2023-09-26

如何添加对象中的所有值？

例如，amoutpay": ["4222","1000"]会给我5222

这是我的目标：

{
    "amoutpay": [ "4222", "1000" ],
    "amtpending": [ "778", "4000" ],
    "totalcost": [ "5000", "5000" ],
    "coursename": [ "Office Automation", "ajaba" ]
}

我想要的是将值添加到变量中。我会使用拆分吗？

var a =
var b =
var c =

您可以使用Array.prototype.reduce()，如下所示：

var obj = {
    "amoutpay": [ "4222", "1000" ],
    "amtpending": [ "778", "4000" ],
    "totalcost": [ "5000", "5000" ],
    "coursename": [ "Office Automation", "ajaba" ]
},
    
    a = obj.amoutpay.reduce(function(prevVal, curVal, curInd) {
        return +prevVal + +curVal;
    }),
    b = obj.amtpending.reduce(function(prevVal, curVal, curInd) {
        return +prevVal + +curVal;
    }),
    c = obj.totalcost.reduce(function(prevVal, curVal, curInd) {
        return +prevVal + +curVal;
    });
console.log( a, b, c );

或者你可以更进一步，定义你自己的数组方法，例如Array.prototype.sum():

var obj = {
        "amoutpay": [ "4222", "1000" ],
        "amtpending": [ "778", "4000" ],
        "totalcost": [ "5000", "5000" ],
        "coursename": [ "Office Automation", "ajaba" ]
    };
Array.prototype.sum = function() {
    return this.reduce(function( prv, cur, ind ) {
        return +prv + +cur;
    });
};
var a = obj.amoutpay.sum(),
    b = obj.amtpending.sum(),
    c = obj.totalcost.sum();
console.log( a, b, c );

var obj = {
    "amoutpay": [ "4222", "1000" ],
    "amtpending": [ "778", "4000" ],
    "totalcost": [ "5000", "5000" ],
    "coursename": [ "Office Automation", "ajaba" ]
}
var a = addValues(obj.amoutpay);
function addValues(arr) {
    return arr.map(function(el) {
        return Number(el);
    }).reduce(function(prev, curr){
        return prev + curr;
    })
}

我们迭代对象元素，对于所有数组，我们检查所有元素是否都是数字。如果是，那么将它们作为变量添加到window对象中，因此在循环之后，我们将为问题中显示的输入提供一个amoutpay变量。注意，如果key恰好已经是一个变量，那么此代码将覆盖它

for (var key in obj) {
    if (Array.isArray(obj[key])) {
        var shouldAdd = true;
        for (var index = 0; shouldAdd && index < obj[key].length; index++) {
            if (isNaN(obj[key][index])) {
                shouldAdd = false;
            }
        }
        if (shouldAdd) {
            window[key] = 0;
            for (var index = 0; index < obj[key].length; index++) {
                window[key] += parseFloat(obj[key][index]);
            }
        }
    }
}
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