我不相信 Dojo 有内置的轮询方法,因此这里有一个适用于跨框架的通用方法
var Poll = function(pollFunction, intervalTime) {
var intervalId = null;
this.start = function(newPollFunction, newIntervalTime) {
pollFunction = newPollFunction || pollFunction;
intervalTime = newIntervalTime || intervalTime;
if ( intervalId ) {
this.stop();
}
intervalId = setInterval(pollFunction, intervalTime);
};
this.stop = function() {
clearInterval(intervalId);
};
};
Usage:
var p = new Poll(function() { console.log("hi!"); }, 1000);
p.start();
setTimeout(function() { p.stop();}, 5000);
或者在你的情况下:
var p = new Poll(sendRequest, 3000);
p.start();
如果您希望将其作为 Dojo 包,那么以下是一个简单的扩展:
dojo.provide("Poll");
dojo.declare("Poll", null, {
intervalId: null,
pollFunction: null,
intervalTime: null,
constructor: function(newPollFunction, newIntervalTime) {
this.pollFunction = newPollFunction;
this.intervalTime = newIntervalTime;
},
start: function(newPollFunction, newIntervalTime) {
this.pollFunction = newPollFunction || this.pollFunction;
this.intervalTime = newIntervalTime || this.intervalTime;
this.stop();
this.intervalId = setInterval(this.pollFunction, this.intervalTime);
},
stop: function() {
clearInterval(this.intervalId);
}
});
Usage:
var p = new Poll(function() {console.log("hi");}, 250);
p.start();
setTimeout(dojo.hitch(p, p.stop), 1000);