當在IE8中設置對象屬性時，「對象不支持此屬性或方法」

Question

我試圖在不使用jQuery的情況下製作可拖動的元素。我希望它與IE8兼容。以下錯誤爲this.handle = {，錯誤爲「對象不支持此屬性或方法」。

IE9 <在設置對象屬性時會有一些愚蠢的掛斷嗎？

var Draggable = function(el){ 
    this.el = el; 
    this.el.style.left = "0px"; 
    this.el.style.top = "0px"; 
    this.origin = {}; 

    this.handle = { 
    drag: this.drag.bind(this), 
    move: this.move.bind(this) 
    }; 

    this.events = { 
    start: new Listener(this.el, ["mousedown", "touchstart"], this.handle.drag), 
    move: {}, 
    end: {} 
    }; 
} 
Draggable.prototype = { 
    drag: function(evt){ 
    this.origin.left = parseInt(this.el.style.left) - evt.clientX; 
    this.origin.top = parseInt(this.el.style.top) - evt.clientY; 
    this.events.move = new Listener(window, ["mousemove", "touchmove"], this.handle.move); 
    this.events.end = new Listener(window, ["mouseup", "touchend"], this.drop.bind(this)); 
    }, 
    move: function(evt){ 
    this.el.style.left = this.origin.left + evt.clientX + "px"; 
    this.el.style.top = this.origin.top + evt.clientY + "px"; 
    }, 
    drop: function(){ 
    this.events.move.stopListening(); 
    } 
} 

Answer 1

Function.prototype.bind()在IE8中不受支持。你可以爲它寫一個polyfill。