[英]typescript Property 'type' does not exist on type 'never'
[英]Typescript: Property does not exist on type 'never', but function works?
这是我的代码
sumDevices() {
let onlineDevicesArray = [];
let offlineDevicesArray = [];
for(let group of this.groups[this.selectedDeviceSource.id]){
for(let device of group.devices){
if(device.onlineState == "Online"){
onlineDevicesArray.push(device.onlineState);
this.onlineDevices = onlineDevicesArray.length;}
else{
offlineDevicesArray.push(device.onlineState);
this.offlineDevices = offlineDevicesArray.length;
}
}
}
}
它在device.onlineState上给出了错误,但该函数确实有效。
TS2339:Property 'onlineState' does not exist on type 'never'.
任何人都可以向我解释为什么它给我这个错误?
您需要为数组提供类型,默认情况下它是“never”。 这样的事情应该有效。
let onlineDevicesArray:number[] = [];
let offlineDevicesArray:any[] = [];
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