字面量自定義事件

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>Document</title>
</head>
<body>
 <button id="button1">clear</button>
 <button id="button2">000</button>javascript

 <script type="text/javascript">
  var Event = {
    _listeners: {},   
    addEvent: function(type, fn) {
        if (typeof this._listeners[type] === "undefined") {
            this._listeners[type] = [];
        }
        if (typeof fn === "function") {
            this._listeners[type].push(fn);
        }   
        return this;
    },
    fireEvent: function(type) {
        var arrayEvent = this._listeners[type];
        if (arrayEvent instanceof Array) {
            for (var i=0, length=arrayEvent.length; i<length; i+=1) {
                if (typeof arrayEvent[i] === "function") {
                    arrayEvent[i]();   
                }
            }
        }   
        return this;
    },
    removeEvent: function(type, fn) {
        var arrayEvent = this._listeners[type];
        if (typeof type === "string" && arrayEvent instanceof Array) {
            if (typeof fn === "function") {
                for (var i=0, length=arrayEvent.length; i<length; i+=1){
                    if (arrayEvent[i] === fn){
                        this._listeners[type].splice(i, 1);
                        break;
                    }
                }
            } else {
                delete this._listeners[type];
            }
        }
        return this;
    }
};html


//------------- 如下爲測試代碼 -----------java

// 添加自定義事件
var fnAlert1, fnAlert2;
Event.addEvent("alert", fnAlert1 = function() {
    alert("第一個彈出!");
}).addEvent("alert", fnAlert2 = function() {
    alert("第二個彈出!");
});測試

// 按鈕綁定事件,用來清除自定義事件
var elButton1 = document.getElementById("button1"),
    elButton2 = document.getElementById("button2");this

elButton1.onclick = function() {
    //Event.removeEvent("alert");
    alert("alert事件清除成功!");
   
    // 此時後一個按鈕臥底了,故隱藏
    elButton2.style.display = "none";
};htm

elButton2.onclick = function() {
    Event.removeEvent("alert", fnAlert1);
    alert("第一個alert清除成功!");
};事件

// 點擊文檔,觸發自定義事件
document.onclick = function(e) {
    e = e || window.event;
    var target = e.target || e.srcElement;
   
    // 若是文檔點擊元素標籤名不是input
    if (!target || !/input|pre/i.test(target.tagName)) {
        Event.fireEvent("alert");
    }
};
 </script>ip


</body>
</html>rem

 

 

連接:https://www.zhangxinxu.com/study/201203/js-custom-events-literal.html文檔

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