Question

我有这个多个数组：

var array = [["par0_0","par0_1","par0_2"],["par1_0","par1_1","par1_2"],["par2_0","par2_1","par2_2"]];

我想在以下字符串数组中转换此数组：

var result = [["par0_0,par1_0,par2_0"],["par0_1,par1_1,par2_1"],["par0_2,par1_2,par2_2"]];

最有效的方式是什么？

Answer 1

您可以toString()使用array将数组值转换为字符串并连接它们。

var myArr = [
  ['par0_0', 'par0_1', 'par0_2'],
  ['par1_0', 'par1_1', 'par1_2'],
  ['par2_0', 'par2_1', 'par2_2']
];

var myArrLen = myArr.length,
  myOutput = []; // The output array

for (var i = 0; i < myArrLen; i++) {
  var arrEl = []; // Initialize the array for inserting sub-array
  for (var j = 0; j < myArr[i].length; j++) {
    arrEl.push(myArr[j][i]); // Add items from same column into sub-array
  }

  myOutput[i] = [arrEl.toString()]; // Assign the string to output array
}
document.write(myOutput);
console.log(myOutput);

jsfiddle Demo

Answer 2

您也可以使用reduce() function两次

[par0_0, par0_1, par0_2].reduce(function(previousValue, currentValue, index, array) {
   var result = "";
   if (index != 0)
   {
      result = ",";
   }
   return result + previousValue + currentValue;
});

Answer 3

您可以使用join()。这是一个例子：

var arr = [["par0_0","par0_1","par0_2"],
["par1_0","par1_1","par1_2"],
["par2_0","par2_1","par2_2"]]

for(var i = 0 ; i < arr.length; i++) {
    arr[i] = [arr[i].join()] ;
}

如果您不想使用逗号，

join()会接受可选的分隔符参数。默认分隔符为逗号。

https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Array/join

在字符串数组中连接多个数组

3 个答案: