如何從一個JSON對象移動一個項目到另一個

Question

我有兩個JSON對象：

open_positions = [{\"id\":83,\"position\":0},{\"id\":82,\"position\":1},{\"id\":79,\"position\":2}] 

done_positions = [{\"id\":85,\"position\":0},{\"id\":84,\"position\":1}] 

如何從給出的ID open_positions選擇一個項目並將其移動到done_positions的頂部？

感謝

Answer 1

open_positions = [{"id":83,"position":0},{"id":82,"position":1},{"id":79,"position":2}]; 
done_positions = [{"id":85,"position":0},{"id":84,"position":1}]; 

id = 82; 

for(key in open_positions){ 
    if(open_positions[key].id === id){ 
     myObj = open_positions[key]; 
    } 
} 

newObj = new Object(); 
newObj[0] = myObj; 
for(key in done_positions){ 
    newObj[key+1] = done_positions[key]; 
} 

console.log(newObj); 

Answer 2

open_positions = [{"id":83,"position":0},{"id":82,"position":1},{"id":79,"position":2}]; 

done_positions = [{"id":85,"position":0},{"id":84,"position":1}]; 

function move_to_done(id){ 
    for(var pos in open_positions){ 
    if(open_positions[pos].id == id){ 
     done_positions.push(open_positions[pos]); 
     delete open_positions[pos]; 
    } 
    } 
} 

move_to_done(83); 

Answer 3

var open_positions = [{"id":83,"position":0},{"id":82,"position":1},{"id":79,"position":2}]; 
var done_positions = [{"id":85,"position":0},{"id":84,"position":1}]; 

for(var index in open_positions){ 
    if(open_positions[index]["id"]=="83"){ 
     done_positions.unshift(open_positions[index]) 
     open_positions.splice(index,1) 
    } 
} 

也有可能是沒有必要的propierty 「位置」，因爲是相同的索引。

Answer 4

如果你不想解析JSON，你可以用這個函數切換ID。

例如：http://jsfiddle.net/ZYED5/1/

function change(id) { 
    var re = new RegExp("(,)?\\{\\\"id\\\"\\:" + id + "\\,\\\"position\\\"\\:[0-9]*\\}(,)?"); 
    var match = open.match(re); 
    done = done.replace("]", "," + (match ? match[0] : "") + "]").replace(",,", ",").replace(",]", "]"); 
    open = open.replace(re, "").replace("}{", "},{"); 
}