javascript - 无法从数组(Javascript)中获取最小值？

Question

我试图从数组中获取最小值，但我遇到了这种奇怪的行为。我的期望是获得 89 作为最小距离，而不是我得到 100。谁能解释一下？

// List 

var nodes = {
    "node": [
      {
        "name": "test",
        "id": "2",
        "edges": {
          "edge": [
            {
              "to": "4",
              "distance": "89"
            },
            {
              "to": "6",
              "distance": "100"
            },
            {
              "to": "8",
              "distance": "500"
            }
          ]
        }
      }]
}

// Initialization
startNode = 0
currentNode = startNode;


edge = nodes.node[currentNode].edges.edge;
var minimumDistance = 99999;

// Loop through the Neighbors of one Node
for (x= 0; x<edge.length; x++) {
  if (edge[x].distance < minimumDistance) {
      minimumDistance = edge[x].distance;
      } 
  document.write('Neighbor: ' + edge[x].to + ', Distance: ' + edge[x].distance);
  document.write('</br>');
}
 document.write('</br>');
document.write('Minimum Distance: ' + minimumDistance );

Answer 1

您需要取一个数字而不是字符串进行比较。比较字符串不同于数字。这是一些示例:

var nodes = { node: [{ name: "test", id: "2", edges: { edge: [{ to: "4", distance: "89" }, { to: "6", distance: "100" }, { to: "8", distance: "500" }] } }] },
    startNode = 0,
    currentNode = startNode,
    edge = nodes.node[currentNode].edges.edge,
    minimumDistance = Infinity, // greatest value
    x;

for (x = 0; x < edge.length; x++) {
    if (+edge[x].distance < minimumDistance) { // unary plus for getting a number
        minimumDistance = edge[x].distance;
    } 
    document.write('Neighbor: ' + edge[x].to + ', Distance: ' + edge[x].distance);
    document.write('</br>');
}
document.write('</br>');
document.write('Minimum Distance: ' + minimumDistance );