Javascript 在数组中,将每个元素与每个元素进行比较并显示差异
我想制作一个javascript算法,将flight1的值与其余两个值进行比较,然后将flight2与flight1和flight3进行比较 结果应该是dif_flight1_flight2=10,dif_flight1_flight3=110Javascript 在数组中,将每个元素与每个元素进行比较并显示差异,javascript,arrays,Javascript,Arrays,我想制作一个javascript算法,将flight1的值与其余两个值进行比较,然后将flight2与flight1和flight3进行比较 结果应该是dif_flight1_flight2=10,dif_flight1_flight3=110 var x = [ ['flight1', '190'], ['flight2', '200'], ['flight3', '300'] ] 存储变量,然后根据这些值计算差值。谷歌如何访问/遍历JS中的二维数组 va
var x = [
['flight1', '190'],
['flight2', '200'],
['flight3', '300']
]
存储变量,然后根据这些值计算差值。谷歌如何访问/遍历JS中的二维数组
var flight1 = (x[0][1]); // 190
var flight2 = (x[1][1]); // 200
var flight3 = (x[2][1]); //300
// Note the variables can be named anything that I declared
var difference = flight2 - flight1; //difference equals 10
你可以这样做:
var x = [
['flight1', '190'],
['flight2', '200'],
['flight3', '300']
];
var result = [];
for(let i = 1; i < x.length; i++) {
let value = parseInt(x[0][1]) - parseInt(x[i][1]);
let element = 'diff_' + x[0][0] + '_' + x[i][0];
result.push({
key: element,
value: Math.abs(value)
});
}
var x=[
['flight1','190'],
['flight2','200'],
['flight3','300']
];
var结果=[];
for(设i=1;i
该算法取第一个元素,并与其他N-1个元素进行比较。在结果数组中,您拥有所有差异
一个问题:为什么使用数组而不是对象数组?必须将每个值与每个值进行比较
function test_dif(){
var x = [
['flight1', '190'],
['flight2', '200'],
['flight3', '300']
];
var result = [];
for(let i = 0; i < x.length; i++) {
for(let c = 0; c < x.length; c++){
let value = parseInt(x[c][1]) - parseInt(x[i][1]);
let element = 'diff_' + x[c][0] + '_' + x[i][0];
result.push({
key: element,
value: Math.abs(value)
});
}
}
return result;
}
只需使用减法运算符?您还可以使用循环遍历数组,并在循环中进行计算检查此
0: {key: "diff_flight1_flight1", value: 0}
1: {key: "diff_flight2_flight1", value: 10}
2: {key: "diff_flight3_flight1", value: 110}
3: {key: "diff_flight1_flight2", value: 10}
4: {key: "diff_flight2_flight2", value: 0}
5: {key: "diff_flight3_flight2", value: 100}
6: {key: "diff_flight1_flight3", value: 110}
7: {key: "diff_flight2_flight3", value: 100}
8: {key: "diff_flight3_flight3", value: 0}