这是我的第一个JSON数组格式......
[
{
"id": "1234",
"caption": "caption1"
},
{
"id": "2345",
"caption": "caption2"
},
{
"id": "3456",
"caption": "caption3"
}
]
这是另一种JSON数组格式
[
[
{
"id": "1234",
"value": "value11"
},
{
"id": "2345",
"value": "value12"
},
{
"id": "3456",
"value": "value13"
}
],
[
{
"id": "1234",
"value": "value21"
},
{
"id": "2345",
"value": "value22"
},
{
"id": "3456",
"value": "value23"
}
]
]
上面提到的两个JSON数组,我需要将每个数据与Id进行比较,并且需要使用javascript格式化带有标题和值的新JSON数组。
[
[
{
"caption" : "caption1",
"value":"value11"
},
{
"caption" : "caption2",
"value":"value12"
},
{
"caption" : "caption3",
"value":"value13"
}
],
[
{
"caption" : "caption1",
"value":"value21"
},
{
"caption" : "caption2",
"value":"value22"
},
{
"caption" : "caption3",
"value":"value23"
}
]
]
请帮帮我。
答案 0 :(得分:1)
你可以通过多种方式实现这一目标。下面我展示了两个变种:
选项1:纯JavaScript
在这个例子中,程序preindex第一个数组用于更快地访问它的数据,然后用map()函数循环遍历第二个数组以创建新的数组数组:
// Create index version of first array
var aix = {};
for(var i=0;i<arr1.length;i++) {
aix[arr1[i].id] = arr1[i].caption;
}
// Loop over array of arrays
var res1 = arr2.map(function(arr22){
return arr22.map(function(a){
return {caption:aix[a.id], value:a.value};
}
});
选项2:使用特殊SQL库(Alasql)
在这里,您可以使用特殊的SQL语句自动加入数组:
var res2 = arr2.map(function(a){
return alasql('SELECT arr1.caption, a.[value] \
FROM ? a JOIN ? arr1 USING id',[a,arr1]);
});
您可以在下面的工作代码段中尝试这些变体,或者使用它in jsFiddle。
(免责声明:我是Alasql)的作者
var arr1 = [
{
"id": "1234",
"caption": "caption1"
},
{
"id": "2345",
"caption": "caption2"
},
{
"id": "3456",
"caption": "caption3"
}
];
var arr2 = [
[
{
"id": "1234",
"value": "value11"
},
{
"id": "2345",
"value": "value12"
},
{
"id": "3456",
"value": "value13"
}
],
[
{
"id": "1234",
"value": "value21"
},
{
"id": "2345",
"value": "value22"
},
{
"id": "3456",
"value": "value23"
}
]
];
// JavaScript version
var aix = {};
for(var i=0;i<arr1.length;i++) {
aix[arr1[i].id] = arr1[i].caption;
}
var res1 = arr2.map(function(arr22){
return arr22.map(function(a){
return {caption:aix[a.id], value:a.value};
});
});
document.getElementById("res1").textContent = JSON.stringify(res1);
// Alasql version
var res2 = arr2.map(function(a){
return alasql('SELECT arr1.caption, a.[value] FROM ? a JOIN ? arr1 USING id',[a,arr1]);
});
document.getElementById("res2").textContent = JSON.stringify(res2);
&#13;
<script src="http://alasql.org/console/alasql.min.js"></script>
<p>Varian 1: JavaScript</p>
<div id="res1"></div>
<p>Variant 2: Alasql</p>
<div id="res2"></div>
&#13;