我有一个JSON格式的对象,我从一个叫teamJSON的变量中读取了这个文件,它看起来像这样。
{"theTeam":[{"teamId":"1","status":"pending"},{"teamId":"2","status":"member"},{"teamId":"3","status":"member"}]}
我想在数组中添加一个新的项目,比如说
{"teamId":"4","status":"pending"}
以至于最后变成
{"theTeam":[{"teamId":"1","status":"pending"},{"teamId":"2","status":"member"},{"teamId":"3","status":"member"},{"teamId":"4","status":"pending"}]}
然后再写回文件。有什么好办法可以添加到新元素中?我接近了,但所有的双引号都被转义了。我已经在SO上找了一个很好的答案,但没有一个能完全涵盖这种情况。希望得到任何帮助。
_JSON_只是一个记号;要进行修改,你要解析
它,这样你就可以把修改应用于本地的_JavaScript对象,然后串化
回到JSON。
var jsonStr = '{"theTeam":[{"teamId":"1","status":"pending"},{"teamId":"2","status":"member"},{"teamId":"3","status":"member"}]}';
var obj = JSON.parse(jsonStr);
obj['theTeam'].push({"teamId":"4","status":"pending"});
jsonStr = JSON.stringify(obj);
// "{"theTeam":[{"teamId":"1","status":"pending"},{"teamId":"2","status":"member"},{"teamId":"3","status":"member"},{"teamId":"4","status":"pending"}]}"
var Str_txt = '{"theTeam":[{"teamId":"1","status":"pending"},{"teamId":"2","status":"member"},{"teamId":"3","status":"member"}]}';
如果你想在最后一个位置添加,那么就用这个。
var parse_obj = JSON.parse(Str_txt);
parse_obj['theTeam'].push({"teamId":"4","status":"pending"});
Str_txt = JSON.stringify(parse_obj);
Output //"{"theTeam":[{"teamId":"1","status":"pending"},{"teamId":"2","status":"member"},{"teamId":"3","status":"member"},{"teamId":"4","status":"pending"}]}"
如果您想在第一个位置**添加,请使用以下代码。
var parse_obj = JSON.parse(Str_txt);
parse_obj['theTeam'].unshift({"teamId":"4","status":"pending"});
Str_txt = JSON.stringify(parse_obj);
Output //"{"theTeam":[{"teamId":"4","status":"pending"},{"teamId":"1","status":"pending"},{"teamId":"2","status":"member"},{"teamId":"3","status":"member"}]}"
任何想在数组的某个位置**添加的人都可以试试这个。
parse_obj['theTeam'].splice(2, 0, {"teamId":"4","status":"pending"});
Output //"{"theTeam":[{"teamId":"1","status":"pending"},{"teamId":"2","status":"member"},{"teamId":"4","status":"pending"},{"teamId":"3","status":"member"}]}"
上面的代码块在第二个元素的后面添加了一个元素。
例如,这里有一个类似于按钮的元素,用于将物品添加到购物篮,并有适当的属性用于保存在localStorage中。
'<a href="#" cartBtn pr_id='+e.id+' pr_name_en="'+e.nameEn+'" pr_price="'+e.price+'" pr_image="'+e.image+'" class="btn btn-primary"><i class="fa fa-shopping-cart"></i>Add to cart</a>'
var productArray=[];
$(document).on('click','[cartBtn]',function(e){
e.preventDefault();
$(this).html('<i class="fa fa-check"></i>Added to cart');
console.log('Item added ');
var productJSON={"id":$(this).attr('pr_id'), "nameEn":$(this).attr('pr_name_en'), "price":$(this).attr('pr_price'), "image":$(this).attr('pr_image')};
if(localStorage.getObj('product')!==null){
productArray=localStorage.getObj('product');
productArray.push(productJSON);
localStorage.setObj('product', productArray);
}
else{
productArray.push(productJSON);
localStorage.setObj('product', productArray);
}
});
Storage.prototype.setObj = function(key, value) {
this.setItem(key, JSON.stringify(value));
}
Storage.prototype.getObj = function(key) {
var value = this.getItem(key);
return value && JSON.parse(value);
}
将JSON对象添加到数组后,结果是(在LocalStorage)。
[{"id":"99","nameEn":"Product Name1","price":"767", "image":"1462012597217.jpeg"},{"id":"93","nameEn":"Product Name2","price":"76", "image":"1461449637106.jpeg"},{"id":"94","nameEn":"Product Name3","price":"87","image":"1461449679506.jpeg"}]
在这个动作之后,你可以很容易地将数据作为List
完整的代码示例在这里