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数组对象在TS中的用法
*
length长度
let songs:string[]=['red','blue','pink']
console.log(songs.length)
*
push**push()** 方法将一个或多个元素添加到数组的末尾，并返回该数组的新长
3.**forEach()** 方法对数组的每个元素执行一次给定的函数,会运行5次，而且中间无法停止。
let songs: string[]=['red','green','pink']
songs.forEach(function(item,index){
console.log('索引为'，index,‘元素为’，item)
})
注：forEach方法的参数是一个函数，这种函数也被称为回调函数
1.item表示数组中的每个元素，相当于songs[i]
2.index表示索引，相当于i
此处的回调函数是作为forEach方法的实参传入，不应该指定类型注解（在调用forEach是已经创建过了)
//理解为隐藏就行
function forEach(callbackfn: (value:string,index:number)=>void){
}
forEach(function(value,index){})
3.some 只要有一个满足条件，就会停止循环,而且会根据返回值，决定是否停止循环（ture,停止；false，继续）
let nums:number[]=[1,2,3,4,5,6]
nums.some(function (num){
if(num>3){
return true
}
return false
})
