Question

预期输出应该类似[“Agri”，“水”]面积值应为[3,3] 我已尝试删除类别数组中的重复项，如果找到重复项，则应进行区域添加

<!DOCTYPE html>
<html>
<body>

<h1>Joining Two Arrays</h1>

<p id="demo"></p>

<script>
var twodim = new Array(); 
var category = ["Agri", "Agri","water"];
var area = [1, 2, 3];

               for (n = 0; n < category.length; n=n+1)
               {

               twodim.push([category[n],area[n]]);

               }

alert(twodim);

document.getElementById("demo").innerHTML = myChildren;
</script>
</body>
</html>

Answer 1

你做得对。但是使用对象而不是数组。对象需要按键，易于按键是检测欺骗的简便方法。如果密钥存在，则执行添加。

var twodim = {}
var category = ["Agri", "Agri", "water"];
var area = [1, 2, 3];

for (var n = 0; n < category.length; n++) {
  if (twodim[category[n]] === undefined) {
    twodim[category[n]] = [category[n], area[n]]
  } else {
    twodim[category[n]][1] += area[n]
  }
}

function getAsArray(obj) {
  return Object.keys(obj).map(function(item) {
    return obj[item];
  });
}
console.log(twodim, getAsArray(twodim))

Answer 2

我希望以下解决方案对您有所帮助。

您还可以在here

中查看此解决方案

var new_cate = new Array();
var new_area = new Array();
var category = ["Agri", "Agri","water"];
var area = [1, 2, 3];

               for (n = 0; n < category.length; n=n+1)
               {

                  var IsFlag = false;
                    for(i=0;i<new_cate.length;i++){

                    if(new_cate[i] == category[n])
                    {
                      new_area[i] += area[n];
                      IsFlag = true;
                    }
                  }
                                    if(!IsFlag)
                                    {
                      new_cate.push(category[n]);
                    new_area.push(area[n]);
                                    }


               }

 console.log(new_cate);
 console.log(new_area);

如何才能执行数组元素的添加

2 个答案: