我正在尝试对Rust中的进程使用异步/等待。我正在使用<script type="text/javascript">
function admissible() {
var b = 4;
var answer = '';
var elementsList = document.querySelectorAll("#question5"+" input:checked");
//get the selected checkbox values for the missing elements
if (elementsList.length >= 0) { //Code works only if some checkbox is checked
elementsList.forEach(function(e,q,t){
if ((e.id.indexOf("photo") > -1) || (e.id.indexOf("name") > -1)) { //yes
answer = 'yes';
}
else {
answer = 'no';
}
});} else {
//display error: you must select a value
}
console.log(answer);
}
</script>
<div class="questionholder" id="question5">
<div>
<h5>Select all elements</h5>
<input class="input5" type="checkbox" id="elementName" name="element" value="name"><label for="elementName"><p class="radioChoice">Name</p></label>
<input class="input5" type="checkbox" id="elementPhoto" name="element" value="photo"><label for="elementPhoto"><p class="radioChoice">Photo</p></label>
<input class="input5" type="checkbox" id="elementSignature" name="element" value="signature"><label for="elementSignature"><p class="radioChoice">Signature</p></label>
</div>
<div class="holdButtons">
<a class="text2button" onclick="admissible()">Next</a>
</div>
</div>
和<script type="text/javascript">
function admissible() {
var b = 4;
var answer = '';
var elementsList = document.querySelectorAll("#question5"+" input:checked");
//get the selected checkbox values for the missing elements
if (elementsList.length >= 0) { //Code works only if some checkbox is checked
elementsList.forEach(function(e,q,t){
if ((e.id.indexOf("photo") > -1) || (e.id.indexOf("name") > -1)) { //yes
answer = 'yes';
}
else {
answer = 'no';
}
});} else {
//display error: you must select a value
}
console.log(answer);
}
</script>
:
tokio
这是我得到的错误:
tokio-process
我该如何正确处理?
答案 0 :(得分:2)
Tokio和相关的板条箱是使用稳定期货0.1条板箱实现的。此板条箱的Future
特质在概念上与标准库中的Future
特质的版本相似,但细节上有很大不同。 async
/ await
语法是围绕标准库中特征的版本构建的。
在Internet上搜索“ tokio async await”会导致使用恰当命名的板条箱tokio-async-await。本文记录了如何使Tokio能够参与不稳定的期货交易:
[dependencies]
tokio = { version = "0.1.15", features = ["async-await-preview"] }
tokio-process = "0.2.3"
在您的代码中,您必须在针对期货0.1板条箱和标准库的特征实现的Future
之间进行转换。一种简单的方法是使用await
宏的Tokio版本:
#![feature(await_macro, async_await, futures_api)]
use std::process::Command;
use tokio_process::CommandExt;
fn main() {
tokio::run_async(main_async());
}
async fn main_async() {
let out = Command::new("echo")
.arg("hello")
.arg("world")
.output_async();
let s = tokio::await!(out);
println!("{:?}", s);
}
$ cargo run
Finished dev [unoptimized + debuginfo] target(s) in 0.10s
Running `target/debug/oo`
Ok(Output { status: ExitStatus(ExitStatus(0)), stdout: "hello world\n", stderr: "" })
经过测试:
另请参阅: