javascript为变量分配错误的值
[英]javascript assigning wrong values to variables
问题描述
For some reason this javascript doesn't seem to calculate properly and keeps giving me infinity for some array values. 
由于某种原因，这个JavaScript似乎没有正确计算，并继续给我无限的一些数组值。
var stock = {
"data": {
"portfolio": [
[1298641715000, 1631.00],
[1298656616000, 1311.00],
[1299606578000, 1311.00],
[1300381305000, 820.50],
[1300813418000, 2074.80],
[1300970915000, 3862.50],
[1300985378000, 4597.35],
[1301071778000, 3554.85],
[1301505492000, 5653.05],
[1302195878000, 4871.80],
[1302368766000, 4079.80],
[1306343616000, 5062.60],
[1307036495000, 5062.60],
[1307726770000, 7207.60],
[1307727695000, 6372.60],
[1312998095000, 5816.10],
[1313430095000, 5816.10],
[1316625492000, 7816.10],
[1316711892000, 6566.10],
[1316713295000, 7777.10],
[1316713295000, 8921.60],
[1316799695000, 10902.10],
[1316886095000, 8627.10],
[1318094770000, 7717.10],
[1318267163000, 6807.10],
[1326306370000, 8228.30],
[1327429500000, 9228.30],
[1328208664000, 10222.05],
[1329503831000, 10188.65],
[1330368095000, 11274.15],
[1330541464000, 12006.75],
[1330714264000, 13222.25],
[1331059408000, 14029.75],
[1331144806000, 15676.55],
[1333648264000, 17256.02],
[1334080424000, 18701.62],
[1336672860000, 19745.42],
[1336758824000, 20018.77],
[1336773969000, 21130.77],
[1337015320000, 20312.47],
[1337277827000, 21650.02],
[1339002758000, 22285.97],
[1341934145000, 23972.67],
[1341934243000, 24182.67],
[1342103859000, 25830.67],
[1342475250000, 25380.67],
[1342654950000, 25669.09],
[1343147542000, 25797.43],
[1343412475000, 25994.43],
[1343658668000, 26203.43],
[1343804523000, 26342.43],
[1343840755000, 26432.43],
[1343922704000, 25914.43],
[1343922759000, 26031.43],
[1345053816000, 26156.43],
[1345138832000, 26253.43],
[1345576479000, 26483.43],
[1345576537000, 26588.43],
[1345656708000, 26628.43],
[1346442006000, 26704.43],
[1346953652000, 26456.43],
[1347553896000, 26586.43],
[1347554286000, 26865.43],
[1347559351000, 27062.43],
[1347560040000, 27533.43],
[1347560369000, 27351.43],
[1347641968000, 26577.43],
[1348063653000, 26860.43],
[1348591198000, 26588.43],
[1348591500000, 26598.43],
[1348668767000, 26728.43],
[1348681823000, 27094.43],
[1349367062000, 27254.43],
[1349368159000, 27379.43],
[1350310748000, 27675.43],
[1350503445000, 27858.43],
[1350923279000, 27979.43],
[1352131960000, 27742.43],
[1353522221000, 27997.43],
[1353685832000, 28299.43],
[1355157961000, 28545.43],
[1355766797000, 28692.43],
[1355947837000, 28913.43],
[1357671266000, 29304.43],
[1357672054000, 29531.44],
[1358448645000, 28856.44],
[1358448738000, 29036.44],
[1358455579000, 29236.44],
[1358540610000, 29430.44],
[1360095697000, 30077.44],
[1360596277000, 30154.44],
[1360612771000, 30651.44],
[1360860220000, 30789.44],
[1360869993000, 31389.44]
],
"portfolio2": [
[1298641715000, 1631.00],
[1298656616000, 1311.00],
[1299606578000, 1311.00],
[1300381305000, 820.50],
[1300813418000, 2074.80],
[1300970915000, 3862.50],
[1300985378000, 4597.35],
[1301071778000, 3554.85],
[1301505492000, 5653.05],
[1302195878000, 4871.80],
[1302368766000, 4079.80],
[1306343616000, 5062.60],
[1307036495000, 5062.60],
[1307726770000, 7207.60],
[1307727695000, 6372.60],
[1312998095000, 5816.10],
[1313430095000, 5816.10],
[1316625492000, 7816.10],
[1316711892000, 6566.10],
[1316713295000, 7777.10],
[1316713295000, 8921.60],
[1316799695000, 10902.10],
[1316886095000, 8627.10],
[1318094770000, 7717.10],
[1318267163000, 6807.10],
[1326306370000, 8228.30],
[1327429500000, 9228.30],
[1328208664000, 10222.05],
[1329503831000, 10188.65],
[1330368095000, 11274.15],
[1330541464000, 12006.75],
[1330714264000, 13222.25],
[1331059408000, 14029.75],
[1331144806000, 15676.55],
[1333648264000, 17256.02],
[1334080424000, 18701.62],
[1336672860000, 19745.42],
[1336758824000, 20018.77],
[1336773969000, 21130.77],
[1337015320000, 20312.47],
[1337277827000, 21650.02],
[1339002758000, 22285.97],
[1341934145000, 23972.67],
[1341934243000, 24182.67],
[1342103859000, 25830.67],
[1342475250000, 25380.67],
[1342654950000, 25669.09],
[1343147542000, 25797.43],
[1343412475000, 25994.43],
[1343658668000, 26203.43],
[1343804523000, 26342.43],
[1343840755000, 26432.43],
[1343922704000, 25914.43],
[1343922759000, 26031.43],
[1345053816000, 26156.43],
[1345138832000, 26253.43],
[1345576479000, 26483.43],
[1345576537000, 26588.43],
[1345656708000, 26628.43],
[1346442006000, 26704.43],
[1346953652000, 26456.43],
[1347553896000, 26586.43],
[1347554286000, 26865.43],
[1347559351000, 27062.43],
[1347560040000, 27533.43],
[1347560369000, 27351.43],
[1347641968000, 26577.43],
[1348063653000, 26860.43],
[1348591198000, 26588.43],
[1348591500000, 26598.43],
[1348668767000, 26728.43],
[1348681823000, 27094.43],
[1349367062000, 27254.43],
[1349368159000, 27379.43],
[1350310748000, 27675.43],
[1350503445000, 27858.43],
[1350923279000, 27979.43],
[1352131960000, 27742.43],
[1353522221000, 27997.43],
[1353685832000, 28299.43],
[1355157961000, 28545.43],
[1355766797000, 28692.43],
[1355947837000, 28913.43],
[1357671266000, 29304.43],
[1357672054000, 29531.44],
[1358448645000, 28856.44],
[1358448738000, 29036.44],
[1358455579000, 29236.44],
[1358540610000, 29430.44],
[1360095697000, 30077.44],
[1360596277000, 30154.44],
[1360612771000, 30651.44],
[1360860220000, 30789.44],
[1360869993000, 31389.44]
],
"standard": []
}
};
var stockbase = stock.data.portfolio;
var stock1 = stock.data.portfolio2;
for (i = 0; i < (stock.data.portfolio2.length); i++) {
stock.data.portfolio2[i][1] = stock.data.portfolio2[i][1] * Math.random();
}
//var performance1 = stock.data.portfolio2;
var i = 0;
while(i<stockbase.length)
{
if (i == 0){
stock1[i][0] = stockbase[i][0];
stock1[i][1] = 0;
} else if (stockbase[i][1] > stockbase[(i - 1)][1]) {
stock1[i][0] = stockbase[i][0];
stock1[i][1] = (stockbase[i][1]) / (stockbase[(i - 1)][1]);
stock1[i][1] -= 1;
stock1[i][1] *= 100;
} else if (stockbase[i][1] < stockbase[(i - 1)][1]) {
stock1[i][0] = stockbase[i][0];
stock1[i][1] = ((stockbase[i][1]) / (stockbase[(i-1)][1]));
stock1[i][1] -= 1;
stock1[i][1] *= 100;
} else {
stock1[i][0] = stockbase[i][0];
stock1[i][1] = 0;
}
i++;
}
//console.log(stockbase);
//console.log(stock1);
var stockbase = stock.data.portfolio2;
var stock2 = stock.data.portfolio;
i = 0;
while(i<stockbase.length)
{
if (i == 0){
stock2[i][0] = stockbase[i][0];
stock2[i][1] = 0;
} else if (stockbase[i][1] > stockbase[(i - 1)][1]) {
stock2[i][0] = stockbase[i][0];
stock2[i][1] = (stockbase[i][1]) / (stockbase[(i - 1)][1]);
stock2[i][1] -= 1;
stock2[i][1] *= 100;
} else if (stockbase[i][1] < stockbase[(i - 1)][1]) {
stock2[i][0] = stockbase[i][0];
stock2[i][1] = ((stockbase[i][1]) / (stockbase[(i-1)][1]));
stock2[i][1] -= 1;
stock2[i][1] *= 100;
} else {
stock2[i][0] = stockbase[i][0];
stock2[i][1] = 0;
}
i++;
}
console.log(stockbase);
console.log(stockbase==stock.data.portfolio2);
the variable stock 1 works perfectly after the loop without any problems. 变量库存1在循环后完美运行，没有任何问题。 Interesting part is after the first while loop, stock.data.portfolio2 has the same array values as stock1 does even though no changes are supposed to be made to stock.data.portfolio2. 有趣的部分是在第一个while循环之后，stock.data.portfolio2具有与stock1相同的数组值，即使不应对stock.data.portfolio2进行任何更改。
I'm confused on what I'm doing wrong. 我对自己做错了很困惑。
1 个解决方案
解决方案1
2 已采纳 2013-02-20 17:18:56
When doing the following: 执行以下操作时：
var stock1 = stock.data.portfolio2;
you are assigning stock1 to a reference of the array stock.data.portfolio2 . 您将stock1分配给数组stock.data.portfolio2的引用。 That means all changes made to stock.data.portfolio2 will also be seen in stock1 . 这意味着对stock.data.portfolio2所做的所有更改也将在stock1看到。 Since stock.data.portfolio2 is an array of arrays I would recommend creating a function to copy that data for you into your variable stock1 由于stock.data.portfolio2是一个数组数组，我建议创建一个函数将该数据复制到变量stock1
function copyPortfolio(arr) {
var s = [];
for(i = 0; i < (arr.length); i++) { s.push(arr[i].slice()); }
return s;
}
var stock1 = copyPortfolio(stock.data.portfolio2);
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