我正在用 javascript 制作一个游戏引擎，需要一些方法来编写一些 Action 。
代码在这里:
<!DOCTYPE html> <html> <body> <script>
var engine={}, actions={}; engine.atomStack=new Array();
events = {
1: ["action1|5","action2|2;2","action1|2"],
2: ["action2|5;2","action2|2;2"],
3: ["action2|5;2","action1|2"] };
engine.runatomStack = function(){
while(engine.atomStack.length > 0){
var actionToRun = engine.atomStack.shift();
actionToRun[0](actionToRun[1]); } };
eventActivate = function(event) {
for (var i = 0; i < events[event].length ; i++) {
var actionAndParam = events[event][i].split('|');
translateActions(actionAndParam[0],actionAndParam[1]); } };
engine.action1 = function( param ) {
console.log("executed action 1, param "+param[0]); }
engine.action2 = function( param ) {
console.log("executed action 2, params "+param[0]+" "+param[1]); }
actions.action1 = function( param ) {
var params = param.split(';');
engine.atomStack.push([engine.action1,params]); }
actions.action2 = function( param ) {
var params = param.split(';');
params[1]=parseInt(params[1],10)+2
engine.atomStack.push([engine.action2,params]); }
translateActions = function(action, param) { actions[action](param); };
</script> </body> </html>
发生了一些事情，我需要在一个事件中运行这些 Action 。我调用 eventActivate 传递应该发生的事件。函数 translateAction 读取此信息并调用设置 Action 的函数。我的逻辑是基于关卡包含事件，事件可以包含 Action ，每个不同的 Action 包含原子。
示例:在某个时候您调用 eventActivate(1) 并将相关事件压入堆栈。然后不时使用引擎并调用 engine.runatomStack() 来执行那里的任何内容。
//engine.atomStack is Array [ ]
eventActivate(2)
//engine.atomStack is Array [ Array[2], Array[2] ]
engine.runatomStack()
//prints:
// "executed action 2, params 5 4" example.html:18
// "executed action 2, params 2 4" example.html:18
//engine.atomStack is Array [ ]
好的，所以我的引擎开始增长，现在我想我需要添加 IF/ELSE 语句和 WHILE/BREAK 循环。我对实现有一些想法，但希望帮助了解使用此队列最有效的方法。很抱歉，如果它是重复的，但无法使用 Google 找到帮助。
我想，如果我有事件:
4: ["action2|5;2","IF|condition","action2|2;2","END|"]
5: ["action2|5;2","IF|condition","action2|2;2","ELSE|","action1|2","END|"]
我不确定到底该怎么做，什么最有效...
jsFiddle 版本链接:http://jsfiddle.net/e3b0kocc/
最佳答案
好的，
我有一个可以解决一些问题的实现，但我认为我不能将一个 if 放在另一个 if 中，这是一个问题。
<!DOCTYPE html> <html> <body> <script>
var engine={}, actions={}; engine.atomStack=new Array();
events = {
1: ["action1|5","action2|2;2","action1|2"],
2: ["action2|5;2","if|true","action1|5","else|","action2|2;2","end|"],
3: ["action2|5;2","action1|2"] };
engine.runatomStack = function(){
while(engine.atomStack.length > 0){
var actionToRun = engine.atomStack.shift();
actionToRun[0](actionToRun[1]); } };
eventActivate = function(event) {
for (var i = 0; i < events[event].length ; i++) {
var actionAndParam = events[event][i].split('|');
translateActions(actionAndParam[0],actionAndParam[1]); } };
evalCondition = function( param ){
return false
}
engine.if = function( param ) {
if ( evalCondition(param)) {
var removeActions = false
for (var i = 0; i < engine.atomStack.length ; i++) {
if(engine.atomStack[i][0] == engine.else) {
removeActions = true
}
if(engine.atomStack[i][0] == engine.end) {
return
}
if(removeActions == true){
engine.atomStack.splice(i)
}
}
} else {
var actionToRun =[0,0]
while(engine.atomStack.length > 0 &&
actionToRun[0] != engine.end &&
actionToRun[0] != engine.else ){
var actionToRun = engine.atomStack.shift();
}
}
}
engine.end = function () {}
engine.else = function () {}
engine.action1 = function( param ) {
console.log("executed action 1, param "+param[0]); }
engine.action2 = function( param ) {
console.log("executed action 2, params "+param[0]+" "+param[1]); }
actions.action1 = function( param ) {
var params = param.split(';');
engine.atomStack.push([engine.action1,params]); }
actions.if = function( param ) {
var params = param.split(';');
engine.atomStack.push([engine.if,params]); }
actions.else = function( param ) {
engine.atomStack.push([engine.else,'']); }
actions.end = function( param ) {
engine.atomStack.push([engine.end,'']); }
actions.action2 = function( param ) {
var params = param.split(';');
params[1]=parseInt(params[1],10)+2
engine.atomStack.push([engine.action2,params]); }
translateActions = function(action, param) { actions[action](param); };
</script> </body> </html>
可以通过运行来测试
eventActivate(2)
engine.runatomStack()
将 evalCondition 的返回值修改为 true 会得到不同的结果。有人可以修改 engine.if 代码以允许 if inside if 吗？
关于javascript - QUEUE and 'IF' 'ELSE' 'WHILE' statements from scratch and running functions，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/26172421/