TypeScript - f.e 是什么类型。设置间隔
TypeScript - what type is f.e. setInterval
如果我想为变量分配一个类型,稍后将像这样分配一个 setInterval:
this.autoSaveInterval = setInterval(function(){
if(this.car.id){
this.save();
}
else{
this.create();
}
}.bind(this), 50000);
应该为 this.autosaveInterval 变量分配什么类型?
使用 typeof 运算符查找任何变量的数据类型,如下所示:
typeof is an unary operator that is placed before a single operand
which can be of any type. Its value is a string that specifies the
type of operand.
var variable1 = "Hello";
var autoSaveInterval;
this.autoSaveInterval = setInterval(function(){
if(this.car.id){
this.save();
}
else{
this.create();
}
}.bind(this), 50000);
console.log("1st: " + typeof(variable1))
console.log("2nd: " + typeof(autoSaveInterval ))
类型为数字;
private autoSaveInterval: number = setInterval(() => {
console.log('123');
}, 5000);
类型取决于您要使用的函数有 2 个重载,return 类型用红色边界框标记:
为了使用return的号码,请使用:
window.setInterval(...)
迟到了,但最好的类型(特别是因为类型是不透明的,我们只关心我们可以稍后将它传递给 clearInterval()
)可能是自动推导的类型,即。类似于:
ReturnType<typeof setInterval>
我相信它的 NodeJS.Timeout 和 widow.setInterval 是数字:
const nodeInterval: NodeJS.Timeout = setInterval(() => {
// do something
}, 1000);
const windowInterval: number = window.setInterval(() => {
// do something
}, 1000);
如果我想为变量分配一个类型,稍后将像这样分配一个 setInterval:
this.autoSaveInterval = setInterval(function(){
if(this.car.id){
this.save();
}
else{
this.create();
}
}.bind(this), 50000);
应该为 this.autosaveInterval 变量分配什么类型?
使用 typeof 运算符查找任何变量的数据类型,如下所示:
typeof is an unary operator that is placed before a single operand which can be of any type. Its value is a string that specifies the type of operand.
var variable1 = "Hello";
var autoSaveInterval;
this.autoSaveInterval = setInterval(function(){
if(this.car.id){
this.save();
}
else{
this.create();
}
}.bind(this), 50000);
console.log("1st: " + typeof(variable1))
console.log("2nd: " + typeof(autoSaveInterval ))
类型为数字;
private autoSaveInterval: number = setInterval(() => {
console.log('123');
}, 5000);
类型取决于您要使用的函数有 2 个重载,return 类型用红色边界框标记:
为了使用return的号码,请使用:
window.setInterval(...)
迟到了,但最好的类型(特别是因为类型是不透明的,我们只关心我们可以稍后将它传递给 clearInterval()
)可能是自动推导的类型,即。类似于:
ReturnType<typeof setInterval>
我相信它的 NodeJS.Timeout 和 widow.setInterval 是数字:
const nodeInterval: NodeJS.Timeout = setInterval(() => {
// do something
}, 1000);
const windowInterval: number = window.setInterval(() => {
// do something
}, 1000);