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The premise is to call Baidu face recognition interface under the vue framework vue project, unable to get this in the reader.onload function, unable to transfer the value to the global Solution: if you encounter this problem, use let that = this to record this in the outer layer of reader.onload function, so that you can get this by using that ...

1 Definition Separate the construction of a complex object from its representation, so that the same construction process can create different representations. Type: creates a class pattern. Four elements: Product class: generally, it is a more complex object, that is to say, the process of creating an object is more complex, and generally th ...

Only two forms are allowed onClick={fn}; or onClick={()=>{fn()}}; //onClick={()=>{fn(id)}}; You can't write that onClick={fn(id)}; in addition onClick={()=>{fn()}}; Equivalent to onClick={fn}; The first writing method (dispatch by parent component, parameter does not flow into TodoItem) TodoList todos ...

meaning of the title In a graph, some edges on the shortest path are removed to make the shortest path unconnected, to judge whether the scheme is unique and to find the sum of edge weights of the least removed edges. thinking First, take out the points on the shortest path. It is obvious that remov ...

The main idea of the topic A number \ (n \) is called a graceful number if and only if its digits can be divided into two sets, the sum of the numbers in the two sets is equal. How many graceful numbers can be found in \ ([a,b] \).\(a,b\leq 10^9\) Analysis The exact solution is digital \ (dp \) but I won't. As the range of \ (a,b \) is coveted, ...

Non recursive merge sort Diagram Explain Code Diagram Explain Algorithms are recursive. Here is a simple non recursive implementation. That is, 2, 2 merge and sort, and then 4, 4 merge and sort until it is finished. Do not group recursively. Note that some code implementations on the Inter ...

Meaning: give the volume of $n $items and the maximum knapsack capacity of $m $, find out the number of schemes of $w\in [1,m] $knapsack after removing one item of $i $. There are n items with volume of W1, W2,... WN. Due to her negligence, the ith item was lost. "How many ways can i use the remaining N – 1 items to fill a backpac ...

Using SELECT in MySQL stored procedures... The INTO statement assigns values to variables: Used to save the column values of a row returned by the query to a local variable. Requirement: There can be only 1 row in the result set of the query. SELECT col_name[,...] INTO var_name[,...] table_expr Use SELECT... The INTO statement queries in t ...

In retrospect, what we have studied is AnnotationConfigApplicationContext annotationConfigApplication = new AnnotationConfigApplicationContext (MainConfig.class); Person person2 = (Person)annotationConfigApplication.getBean("person2"); The realization of these two sentences comes to the constructor implementation of annotationco ...

1. Common current limiting algorithms 1.1 counter algorithm Count the number of requests allowed to pass over a period of time. For example, qps is 100, that is, the number of requests allowed to pass in 1s is 100. Add 1 to each request counter. If the request is rejected more than 100, the counter will clear after 1s, and the counter will be c ...