我如何在对象中添加所有值?
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 =
答案 0 :(得分:4)
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 );

或者您可以更进一步定义自己的数组方法,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 );

答案 1 :(得分:2)
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;
})
}
答案 2 :(得分:1)
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,则将它们作为变量添加到window
对象,因此在循环之后,我们将为问题中显示的输入提供amoutpay
变量。请注意,如果key
恰好已经是变量,则此代码将覆盖它。
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]);
}
}
}
}