我正在尝试编写一个逻辑来修改包含对象列表的数组。例如:
[
{
"S.N.": "1",
"ITEM": "CIGARETTES",
" QUANTITY SOLD ": " 3,603,221 ",
"UNIT OF MEASURE": "CARTONS"
},
{
"S.N.": "2",
"ITEM": "LIQUOR",
" QUANTITY SOLD ": " 5,680,586 ",
"UNIT OF MEASURE": "BOTTLES"
},
{
"S.N.": "3",
"ITEM": "BEER",
" QUANTITY SOLD ": " 7,581,446 ",
"UNIT OF MEASURE": "CANS"
}]
这样我将得到如下的最终结果:
"CIGARETTES": {
"S.N.": "1",
"ITEM": "CIGARETTES",
"QUANTITY": " 3,603,221 ",
"UNIT": "CARTONS"
},
"LIQUOR": {
"S.N.": "2",
"ITEM": "LIQUOR",
"QUANTITY": " 5,680,586 ",
"UNIT": "BOTTLES"
},
"BEER": {
"S.N.": "3",
"ITEM": "BEER",
"QUANTITY": "7,581,446 ",
"UNIT": "CANS"
}
我希望ITEM名称显示在上面给出的对象之前。我的逻辑如下:
var callMe = function(){
var newJson = json.map(function(item){
var newItem = JSON.stringify(JSON.parse(item));
newItem = item.ITEM + ':' + {item};
return console.log(newItem)
})
}
当我安装它时,我会收到以下信息:
CIGARETTES:[object Object]
LIQUOR:[object Object]
BEER:[object Object]
GOLD:[object Object]
WATCHES:[object Object]
请告诉我如何阻止对象转换为字符串。
关于JSON是什么(Javascript Object Notation)似乎存在误解。它只是发送数据的格式。
你正在使用的只是一个数组/对象。
您永远不应该修改字符串化对象来添加数据。使用对象本身然后对其进行字符串化。
const data=[{"S.N.":"1","ITEM":"CIGARETTES"," QUANTITY SOLD ":" 3,603,221 ","UNIT OF MEASURE":"CARTONS"},{"S.N.":"2","ITEM":"LIQUOR"," QUANTITY SOLD ":" 5,680,586 ","UNIT OF MEASURE":"BOTTLES"},{"S.N.":"3","ITEM":"BEER"," QUANTITY SOLD ":" 7,581,446 ","UNIT OF MEASURE":"CANS"}]
const res = data.reduce((a,c)=>{
a[c.ITEM] = c;
return a;
}, {});
console.log(res);
//then JSON.stringify res
非减少版本:
const data=[{"S.N.":"1","ITEM":"CIGARETTES"," QUANTITY SOLD ":" 3,603,221 ","UNIT OF MEASURE":"CARTONS"},{"S.N.":"2","ITEM":"LIQUOR"," QUANTITY SOLD ":" 5,680,586 ","UNIT OF MEASURE":"BOTTLES"},{"S.N.":"3","ITEM":"BEER"," QUANTITY SOLD ":" 7,581,446 ","UNIT OF MEASURE":"CANS"}]
const res = {};
for(let i = 0; i < data.length; i++){
res[data[i].ITEM] = data[i];
}
console.log(res);
//then JSON.stringify res
你可以使用reduce
进行转换
const x = [
{
"S.N.": "1",
"ITEM": "CIGARETTES",
" QUANTITY SOLD ": " 3,603,221 ",
"UNIT OF MEASURE": "CARTONS"
},
{
"S.N.": "2",
"ITEM": "LIQUOR",
" QUANTITY SOLD ": " 5,680,586 ",
"UNIT OF MEASURE": "BOTTLES"
},
{
"S.N.": "3",
"ITEM": "BEER",
" QUANTITY SOLD ": " 7,581,446 ",
}];
const y = x.reduce(function(acc, item){
acc[item.ITEM]= item;
return acc;
}, {})
console.log(y);
遍历数组并将每个数组添加到对象:
const items = [{
"S.N.": "1",
"ITEM": "CIGARETTES",
" QUANTITY SOLD ": " 3,603,221 ",
"UNIT OF MEASURE": "CARTONS"
},
{
"S.N.": "2",
"ITEM": "LIQUOR",
" QUANTITY SOLD ": " 5,680,586 ",
"UNIT OF MEASURE": "BOTTLES"
},
{
"S.N.": "3",
"ITEM": "BEER",
" QUANTITY SOLD ": " 7,581,446 ",
"UNIT OF MEASURE": "CANS"
}
]
const output = {}
items.forEach(i => {
output[i.ITEM] = i
})
console.log(output)