<script>
var arr = [1, 2,6,9]
Array.prototype.$map = function (callback) {
let arr = this
let ans = new Array()
for (let i = 0; i < arr.length; i++) {
ans.push(callback(arr[i]))
}
return ans
}
var result = arr.$map((item) => {
return item * 10
})
console.log(result);
</script>
js 简单版map
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转载自blog.csdn.net/weixin_48329823/article/details/123229811
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