问题
I just want to change all the keys in batchesX. But I can't seem to alter all keys, because of concat. This is what I learned from post.
Please advise how I can change all keys with numbers.
var batchesX = '[{"batch":"0010002033"},{"batch":"0010001917"},{"batch":"0000020026"},{"batch":"0000017734"},'+
'{"batch":"0000015376"},{"batch":"0000014442"},{"batch":"0000014434"},{"batch":"0000014426"},'+
'{"batch":"0000013280"},{"batch":"0000012078"},{"batch":"0000012075"},{"batch":"0000012072"},'+
'{"batch":"0000011530"},{"batch":"0000011527"},{"batch":"0000011342"},{"batch":"0000010989"},'+
'{"batch":"0000010477"},{"batch":"0000008097"},{"batch":"0000007474"},{"batch":"0000006989"},'+
'{"batch":"0000004801"},{"batch":"0000003566"},{"batch":"0000003565"},{"batch":"0000001392"},'+
'{"batch":"0000001391"},{"batch":"0000000356"},{"batch":"0000"},{"batch":"000"},{"batch":""},'+
'{"batch":null}]'; // 30 elements
//in JSON text
var batchi = "batch";
var obj_batchesY = JSON.parse(batchesX);
console.debug(obj_batchesY);
var obj_batchesYlength = obj_batchesY.length;
console.debug(obj_batchesYlength);
var obj_batchesX = JSON.parse(batchesX,
function(k,v)
{
for(var i=1; i <= obj_batchesYlength; i++ )
{
if(k=="batch")
{
this.batchi.concat(string(i)) = v;
}
else
return v;
}
}
);
console.debug(obj_batchesX);
Is the code too long winded?
Many thanks in advance. Clement
回答1:
The return value of the reviver function only replaces values. If you need to replace keys, then use stringify
and replace
before the parse
call, like this:
JSON.parse(JSON.stringify({"alpha":"zulu"}).replace('"alpha":','"omega":'))
Here is how to replace all numeric keys:
function newkey()
{
return Number(Math.random() * 100).toPrecision(2) + RegExp.$1
}
//Stringify JSON
var foo = JSON.stringify({"123":"ashanga", "12":"bantu"});
//Replace each key with a random number without replacing the ": delimiter
var bar = foo.replace(/\d+("?:)/g, newkey)
//Parse resulting string
var baz = JSON.parse(bar);
Make sure each replaced key is unique, since duplicate keys will be removed by the parse
method.
来源:https://stackoverflow.com/questions/16435711/javascript-using-reviver-function-i-seem-cant-get-to-alter-all-the-keys-whil