Question

当前，我在存储操作中使用package com.company; import java.util.regex.Pattern; import java.util.regex.Matcher; public class Main { public static void main(String[] args) { // write your code here String myString = "{\n" + " \"8\": [\n" + " {\n" + " \"TEST\": \"LN17ELJ\",\n" + " \"ROUTE_UNIQUE_ID_REFERENCE\": \"2172752\",\n" + " \"ORDER_UNIQUE_ID_REFERENCE\": \"109197634\",\n" + " \"STATUS\": \"HORLEY\",\n" + " \"SECONDARY_NAV_CITY\": \"HORLEY\",\n" + " \"ROUTE\": \"THE STREET 12\",\n"; String myRegexPattern = "\"([ROUTE_UNIQUE_ID_REFERENCE\"]+)\"\\s*:\\s*\"([^\"]+)\",?"; String[] newValue = myString.split(myRegexPattern); for(int i = 0; i < newValue.length; i++) { if(newValue[i].equals("2172752")) { System.out.println("IT'S HERE!"); } } } }，但希望将其转换为promises。这是带有promise的存储操作的示例：

async/await

此fetchActiveWorkspace (context, workspaceID) { if (workspaceID) { return this.$axios.get(`@api-v01/workspaces/workspace/${workspaceID}`) .then(response => { context.commit('setActiveWorkspace', response.data) }) .catch(err => { throw err }) } else { return Promise.resolve(true) } },操作在组件中得以解决，因为它返回了fetchActiveWorkspace。如何将该代码段转换为promise结构并在组件中使用？

Answer 1

这就是我尝试翻译的方式；考虑到由于我无法在完整上下文中访问原始代码，因此我无法直接尝试以确保其有效；但这仍然是您可以在承诺中使用async/await的方式。

// 1. Mark the function as `async` (otherwise you cannot use `await` inside of it)
async fetchActiveWorkspace(context, workspaceID) {
    if (workspaceID) {

      // 2. Call the promise-returning function with `await` to wait for result before moving on.
      // Capture the response in a varible (it used to go as argument for `then`)
      let response = await this.$axios.get(`@api-v01/workspaces/workspace/${workspaceID}`);
      context.commit('setActiveWorkspace', response.data);
    }

    // 3. I don't think this is necessary, as actions are not meant to return values and instead should be for asynchronous mutations.
    else {
      return true;
    }
}

如果要捕获和处理异常，可以用try/catch包围函数的主体。我之所以没有添加它是为了使事情简单，因为您基于承诺的代码将仅捕获并重新抛出异常，而无需执行其他任何操作。

Vuex从Promise到异步/等待的存储操作

1 个答案: