[英]how do i add two event listeners/actions to one button
我正在尝试暂停并在“按钮”上播放,但不确定如何执行。 我猜想它需要知道一个单击是活动的才能切换到另一个,但是我不确定如何做到这一点。
// Initialize variables
var button = document.getElementById("button");
var button2 = document.getElementById("button2");
var rect = document.getElementById("rect");
var polygon = document.getElementById("polygon");
var circle = document.getElementById("circle");
// Define functions
function play() {
rect.setAttribute("class", "anim");
polygon.setAttribute("class", "anim");
circle.setAttribute("class", "anim");
}
function pause() {
rect.setAttribute("class", "pause");
polygon.setAttribute("class", "pause");
circle.setAttribute("class", "pause");
}
// Add event listeners
button.addEventListener("click", play, false);
button2.addEventListener("click", pause, false);
您可以改写一个切换处理程序:
function playPause()
{
if (this.playState) {
rect.className = polygon.className = circle.className = 'pause';
} else {
rect.className = polygon.className = circle.className = 'anim';
}
// update button text to indicate state?
this.playState = !this.playState;
}
它在DOM元素本身上保持状态,并在暂停和播放之间切换。
如果您使用两个不同的按钮,请尝试以下操作:
var isplaying = false;
function play() {
isplaying = true;
rect.setAttribute("class", "anim");
polygon.setAttribute("class", "anim");
circle.setAttribute("class", "anim");
}
function pause() {
isplaying = false;
rect.setAttribute("class", "pause");
polygon.setAttribute("class", "pause");
circle.setAttribute("class", "pause");
}
// Add event listeners
button.addEventListener("click",function(){ if(!isplaying){
button.disable(); button2.enable(); play();}});
button2.addEventListener("click",function(){ if(isplaying){
button2.disable(); button.enable(); pause();}});
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