Javascript 为什么推送显示“any[]”类型的参数不可分配给“从不”错误类型的参数？
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Why push shows argument of type 'any[]' is not assignable to parameter of type 'never' error?
提问by Parsaria
In this code i get the fallowing error:
在这段代码中，我得到了以下错误：
Argument of type 'any[]' is not assignable to parameter of type 'never'
“any[]”类型的参数不可分配给“never”类型的参数
var markers: [];
this.Getlapoints(this.map.getCenter(), 500000).then(data => {
for (var key in data) {
Leaflet.marker(data[key].location, //{ icon: greenIcon }
).addTo(this.map).bindPopup(data[key].caption);
// markers.push(data[key].location.lat,data[key].location.lng);
// markers.push(data[key].location);
var lat = data[key].location.lat;
var lng = data[key].location.lng;
markers.push([lat, lng]);
}
console.log(markers);
});
回答by Matt McCutchen
With var markers: []you are declaring the markersarray as having the type of a permanently empty array. You probably meant var markers = []to initialize it to empty but allow items to be added.
随着var markers: []您将markers数组声明为具有永久空数组的类型。您可能打算var markers = []将其初始化为空但允许添加项目。
回答by Denis TRUFFAUT
Change this :
改变这一点：
const a = [];
By this :
这样 ：
const a = Array();
回答by Programmer
The never type is a subtype of, and assignable to, every type; however, no type is a subtype of, or assignable to, never (except never itself). Even any isn't assignable to never.
never 类型是每个类型的子类型，并且可以分配给每个类型；但是，没有任何类型是 never 的子类型或可分配给 never（除了 never 本身）。甚至 any 也不能分配给 never。
From the TypeScript docs
