One-liner doesn't work with IE?

今天碰到一个问题:FireFox, Google Chrome等浏览器都OK,唯独IE报错(IE6)。大家都知道IE6报错信息基本上对你定位错误没有帮助。

我安装IE8,它精准定位到了这儿:

/**
 * Generates unique ids. If the element already has an id, it is unchanged
 * @param {Mixed} el (optional) The element to generate an id for
 * @param {String} prefix (optional) Id prefix (defaults "ext-gen")
 * @return {String} The generated Id.
 */
id : function(el, prefix){
    return (el = Ext.getDom(el) || {}).id = el.id || (prefix || "ext-gen") + (++idSeed);
}

这句能出什么问题?可能这句太晦涩了,IE看不懂它。

我试试换一种写法:

id : function(el, prefix){
    //return (el = Ext.getDom(el) || {}).id = el.id || (prefix || "ext-gen") + (++idSeed);
    el = Ext.getDom(el)||{};
    if(el.id){
        return el.id;	
    }
    el.id = (prefix || 'ext-gen') + (++idSeed);
    return el.id;
}

Guess what? 居然就通过了!

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