textarea 手機上不顯示捲軸，且不能滾動

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找了一個老外重寫的可滑動的 textarea:

Ext.define(‘LeslieTest.view.TextArea‘,{    extend : ‘Ext.field.TextArea‘,    xtype : ‘scrollTextArea‘,        initialize : function() {        this.callParent();        this.element.dom.addEventListener(                Ext.feature.has.Touch ? ‘touchstart‘                        : ‘mousedown‘,                this.handleTouchListener = Ext.bind(                        this.handleTouch, this), false);        this.element.dom.addEventListener(                Ext.feature.has.Touch ? ‘touchmove‘                        : ‘mousemove‘,                this.handleMoveListener = Ext.bind(                        this.handleMove, this), false);        this.moveListenersAttached = true;    },        destroy : function() {        if (this.moveListenersAttached) {            this.moveListenersAttached = false;            this.element.dom.removeEventListener(                    Ext.feature.has.Touch ? ‘touchstart‘                            : ‘mousedown‘,                    this.handleTouchListener, false);            this.element.dom.removeEventListener(                    Ext.feature.has.Touch ? ‘touchmove‘                            : ‘mousemove‘,                    this.handleMoveListener, false);            this.handleTouchListener = this.handleMoveListener = null;        }        this.callParent();    },        handleTouch : function(e) {        this.lastY = e.pageY;    },        handleMove : function(e) {        var textArea = e.target;        var top = textArea.scrollTop <= 0;        var bottom = textArea.scrollTop + textArea.clientHeight >= textArea.scrollHeight;        var up = e.pageY > this.lastY;        var down = e.pageY < this.lastY;        this.lastY = e.pageY;        if ((top && up) || (bottom && down))            e.preventDefault();        if (!(top && bottom))            e.stopPropagation();    }});

textarea 手機上不顯示捲軸，且不能滾動