removeEventListener取消監(jiān)聽事件不起作用

因為要移除監(jiān)聽事件，所以不能用匿名函數(shù)，只能用公共函數(shù)名，但是用公共函數(shù)名又會報其他的錯，懵逼

圖片描述

代碼如下

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
        <title>Examples</title>
        <style>
        /* 滑動控件容器,亮灰色背景 */
        #dragContainer {
            position: relative;
            display: inline-block;
            background: #e8e8e8;
            width: 300px;
            height: 33px;
            border: 2px solid #e8e8e8;
        }
        /* 滑塊左邊部分,綠色背景 */
        #dragBg {
            position: absolute;
            background-color: #7ac23c;
            width: 0px;
            height: 100%;
        }
        /* 滑動驗證容器文本 */
        #dragText {
            position: absolute;
            width: 100%;
            height: 100%;
            /* 文字水平居中 */
            text-align: center;
            /* 文字垂直居中,這里不能用百分比,因為百分比是相對原始line-height的,而非div高度 */
            line-height: 33px;
            /* 文本不允許選中 */
            user-select: none;
            -webkit-user-select: none;
        }
        /* 滑塊 */
        #dragHandler {
            position: absolute;
            width: 40px;
            height: 100%;
            cursor: move;
        }
        /* 滑塊初始背景 */
        .dragHandlerBg {
            background: #fff no-repeat center url("data:image/png;base64,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");
        }
        /* 驗證成功時的滑塊背景 */
        .dragHandlerOkBg {
            background: #fff no-repeat center url("data:image/png;base64,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");
        }
    </style>
    </head>
<body>
    <div id="dragContainer">
        <div id="dragBg"></div>
        <div id="dragText"></div>
        <div id="dragHandler" class="dragHandlerBg"></div>
    </div>
    <script type="text/javascript">
        /**
         * 
         * @authors ZM
         * @date    2017-11-05 09:29:18
         * @version 1.0
         */
        SlideByZM = (function(){
            var Obj = function(options){
                this._setPara(options);
                this.init();
            };
            Obj.prototype = {
                constructor: Obj,
                init: function(){
                    var _this = this;
                    this.dragText.textContent = "拖動滑塊驗證";
                    //方法一 把方法一全部展開，注釋方法二可以滑動，但是取消不了監(jiān)聽事件
                    this.dragHandler.addEventListener("mousedown", function(){
                        _this._mouseDown();
                    },false);
                    //方法二  這樣寫會報錯  _this._mouseDown is not a function,不懂為什么會這樣
                    // this.dragHandler.addEventListener("mousedown", _this._mouseDown,false);
                },
                _mouseDown: function(ev){
                    var _this = this;
                    var ev = ev || event;
                    //方法一
                    document.addEventListener("mousemove", function(){
                        _this._mouseMove();
                    },false);
                    //方法二
                    // document.addEventListener("mousemove",_this._mouseMove,false);
                    //方法一
                    document.addEventListener("mouseup", function(){
                        _this._mouseUp();
                    },false);
                    //方法二
                    // document.addEventListener("mouseup", _this._mouseUp,false);
                },
                _mouseMove: function(ev){ 
                    var ev = ev || event;
                    var _this = this;
                    this.left = event.clientX - this.dragHandler.clientWidth / 2;
                    if(this.left < 0) {
                        this.left = 0;
                    } else if(this.left > this.maxHandlerOffset) {
                        this.left = this.maxHandlerOffset;
                        this._verifySucc();
                    }
                    this.dragHandler.style.left = this.left + "px";
                    this.dragBg.style.width = this.dragHandler.style.left;
                },
                _mouseUp: function(ev){
                    var ev = ev || event;
                    var _this = this;
                    document.removeEventListener("mousemove", _this._mouseMove,false);
                    document.removeEventListener("mouseup", _this._mouseUp,false);
                    this.dragHandler.style.left = 0;
                    this.dragBg.style.width = 0;
                },
                _verifySucc: function(){
                    var _this = this;
                    this.isVertifySucc = true;
                    this.dragText.textContent = "驗證通過";
                    this.dragText.style.color = "white";
                    this.dragHandler.setAttribute("class", "dragHandlerOkBg");
                    this.dragHandler.removeEventListener("mousedown", _this._mouseDown,false);
                    document.removeEventListener("mousemove", _this._mouseMove,false);
                    document.removeEventListener("mouseup", _this._mouseUp,false);
                },
                _setPara: function(option){
                    this.dragContainer = option.dragContainer;
                    this.dragHandler = option.dragHandler;
                    this.dragBg = option.dragBg;
                    this.dragText = option.dragText;
                    this.isVertifySucc = false;
                    this.maxHandlerOffset = this.dragContainer.clientWidth - this.dragHandler.clientWidth;
                }
            };
            return Obj;
        })();
    </script>
    <script type="text/javascript">
        var a = document.getElementById("dragContainer");
        var b = document.getElementById("dragBg");
        var c = document.getElementById("dragText");
        var d = document.getElementById("dragHandler");
        var example = new SlideByZM({
            dragContainer : a,
            dragBg : b,
            dragText : c,
            dragHandler : d
        });
    </script>
</body>
</html>

回答

編輯回答

痞性

addEventListener('mousemove',this._mouseMove,false)
你綁定事件是一個匿名函數(shù)，所以解綁的時候沒辦法移除
改了一下
綁定事件都用bind一下,_this._mouseDown.bind(this)
_mouseMove里面有個event改成ev就好了
其他的你再改改

2018年4月22日 16:48

編輯回答