Javascript findIndex不是一个函数 [英] Javascript findIndex is not a function
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问题描述
我有一个json数组:
[
{id:19,name: Jed,姓氏:DIAZ,爱好:照片,生日:2011/11/22},
{id:20,name:Judith ,姓:HENDERSON,爱好:宠物,生日:1974/06/12},
{id:21,name:Nicolai,姓氏:GRAHAM,业余爱好:阅读,生日:2005/01/22},
{id:22,name:Vasile,lastname :BRYANT,业余爱好:唱歌,生日:1987/03/17}
]
从json数组中删除项目的函数
removeItem:function(removeId){
//参数验证
返回dataLoad.then(函数(数据){
f = data.findIndex(function(item){return item.id == removeId;});
如果(f <0)
返回false;
data.splice(f,1);
LS.setData(数据,cutomers );
返回true;
});
}
当代码运行时出现错误:
findIndex不是函数
错误行
f = data.findIndex(function(item){return item.id == removeId;});
解决方案
findIndex
不是
I have a json array:
[
{"id":19,"name":"Jed", "lastname":"DIAZ", "hobby":"photo", "birthday":"2011/11/22"},
{"id":20,"name":"Judith", "lastname":"HENDERSON", "hobby":"pets", "birthday":"1974/06/12"},
{"id":21,"name":"Nicolai", "lastname":"GRAHAM", "hobby":"reading", "birthday":"2005/01/22"},
{"id":22,"name":"Vasile", "lastname":"BRYANT", "hobby":"singing", "birthday":"1987/03/17"}
]
function to remove a item from json array
removeItem: function(removeId){
//paramater validation
return dataLoad.then(function(data){
f = data.findIndex(function(item) { return item.id == removeId; });
if(f < 0)
return false;
data.splice(f,1);
LS.setData(data,"cutomers");
return true;
});
}
When the code is running there is an error:
findIndex is not a function
error line
f = data.findIndex(function(item) { return item.id == removeId; });
解决方案
findIndex
is not a prototype method of Array
in ECMASCRIPT 262, you might need filter
combined with indexOf
, instead, it has the advantage of stopping searching as soon as entry is found
var f;
var filteredElements = data.filter(function(item, index) { f = index; return item.id == removeId; });
if (!filteredElements.length) {
return false;
}
data.splice(f, 1);
EDIT as suggested in comments by Nina Scholz:
This solution is using Array.prototype.some
instead
var f;
var found = data.some(function(item, index) { f = index; return item.id == removeId; });
if (!found) {
return false;
}
data.splice(f, 1);
Found at Array.prototype.findIndex MDN
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