javascript - 将对象转换为顺序数组格式 - javascript？

Question

我有以下对象结构

 var obj = {"0":"direct","1":"indirect","2":"dir","3":"indir"};

预期输出为:

result = [["direct","indirect"],["indirect","dir"],["dir","indir"]];

我尝试过的:

    var result = [];
    var array = [];
    for(var key in obj){
          if(array.length <2) {
              array.push(obj[key]);
          }else{
              array =[];
              array.push(obj[key-1]);
           }

       if(array.length == 2){
            result.push(array);
       }
     }
   console.log(result);

我得到的输出如下:

result = [["direct", "indirect"], ["indirect", "indir"]]

Answer 1

如果它们都是至少包含一个字符的字符串，那么您可以这样做:

var obj = {"0":"direct","1":"indirect","2":"dir","3":"indir"};
var result = [];

for (var i = 1; obj[i]; i++) {
    result.push([obj[i-1], obj[i]]);
}

它从索引 1 开始，并将当前和上一个项目推送到数组中。只要值是真值，它就会继续，所以如果有空字符串，它就会停止。

如果可能需要包含错误值，那么您应该首先对属性进行计数。

var obj = {"0":"direct","1":"indirect","2":"dir","3":"indir"};
var result = [];

var len = Object.keys(obj).length;

for (var i = 1; i < len; i++) {
    result.push([obj[i-1], obj[i]]);
}