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View Code? Open in Web Editor NEW📖 前端面试常见手写题整理
📖 前端面试常见手写题整理
可以在代码中添加注释,比如题目背景,原理,一些过程中的注释
res.length === arr.length
这一句,并不能保证所有promise都resolve了
若res[1]=1,则res.length=2;
但res[0]对应的promise不一定resolve了。
仓库里的实现输出是 number 不是 number[],然后 arr 的状态转移也不太对。不知道是题不一样还是写成了别的。
自己实现了一下
function lis(nums: number[]): number[]{
if (nums.length === 0) return [];
const arr = new Array(nums.length).fill(1); // 保存以当前位置结尾的最大连续子串长度
for (let i = 1; i < nums.length; i++) {
if(nums[i]>nums[i-1]){
arr[i] = Math.max(arr[i-1] + 1, 1)
}
}
const lastIndex = arr.indexOf(Math.max(...arr))
return nums.slice(lastIndex + 1 - arr[lastIndex],lastIndex + 1)
}
console.log(lis([1,2,3,2,3,4,5]))
Function.prototype.myCall = function (context, ...paramsArr) {
if (context === null || context === undefined) {
context = window;
} else {
context = Object(context); // ***
}
const specialPrototype = Symbol("特殊属性Symbol");
context[specialPrototype] = this;
const result = contextspecialPrototype;
delete context[specialPrototype];
return result;
};
在没有resolve的时候直接调.then的话, 会进入reject
bind函数的返回值里可以传递参数。
我的实现是:
Function.prototype.bindNew = function (context, ...args) {
return (...newArgs) => this.apply(context, [...args, ...newArgs]);
};
// test
const test = {
name: "fy",
showName: function (last: string) {
console.log(this.name + " is " + last);
},
};
test.showName("handsome"); // fy is handsome
test.showName.bind({ name: "Mr.fy" })("handsome");
test.showName.bindNew({ name: "Mr.fy" })("handsome");
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