使用 javascript 延迟 for 循环
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/27443185/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
delay a for loop with javascript
提问by Linda
I want to delay a "for loop" for a while but don't know how to do it.
我想将“for 循环”延迟一段时间，但不知道该怎么做。
For example. Let's say this "for loop" runs from 0 to 8 and after each i there should be a delay for 2 sek.
例如。假设这个“for 循环”从 0 到 8 运行，并且在每个 i 之后应该有 2 秒的延迟。
for (var i=0; i<8; i++{
do something...
wait for 2 sek. and go on with i=i++;
}
回答by metadings
You'll have to go that way:
你必须走那条路：
function jsHello(i) {
if (i < 0) return;
setTimeout(function () {
alert("Hello " + i);
jsHello(--i);
}, 2000);
}
jsHello(5);or
或者
function jsHello(i) {
alert("Hello " + i);
if (--i > -1) {
setTimeout(function () { jsHello(i); }, 2000);
}
}
jsHello(5);回答by jcbermu
Javascript doesn't have a wait command. The way to get this behavior is using setTimeout:
Javascript 没有等待命令。获得这种行为的方法是使用setTimeout：
for (var i=0; i<8; i++){
do_something(i);
}
function do_something(j) {
setTimeout(function() {
tasks to do;
}, 2000 * j);
}
Every time the function do_something()is called, it executes "tasks to do"scheduled by 2000*imilliseconds.
每次do_something()调用该函数时，它都会执行以毫秒为单位调度的“要执行的任务”2000*i。
回答by Evgeniy
To resolve this task you have to use closure - immediately invoke function witch be called on every iteration with ias param, and setTimeout inside this function. In this case param you passed will be stored in scope and could be used in timeout callback:
要解决此任务，您必须使用闭包 - 立即调用在每次迭代中使用ias param 和 setTimeout 调用的函数。在这种情况下，您传递的参数将存储在作用域中并可用于超时回调：
for (var i=0; i<8; i++) (function(t) {
window.setTimeout(function() {
//do anything with t
}, t*2000)
}(i))
