为什么此代码在FireFox和IE中不能使用，而在Chrome中不能使用？

Question

I am currently using this code:

Code can be seen here - http://jsbin.com/ESOdELU/1/edit

var wordRandomizer = {
    run: function (targetElem) {
        var markup = this.createMarkup();
        targetElem.appendChild(markup);
    },
    createMarkup: function () {
        var that = this;
        var frag = document.createDocumentFragment();
        this.elem = document.createElement('span');
        var button = document.createElement('button');
        button.innerText = 'Change Item';
        button.addEventListener('click', function () {
            that.changeItem();
        });
        frag.appendChild(this.elem);
        frag.appendChild(button);
        return frag;
    },
    changeItem: function () {
        var rand = this.getRandInt(1, this.items.length) - 1;
        console.log(rand);
        this.elem.innerText = this.items[rand];
    },
    getRandInt: function (min, max) {
        return Math.floor(Math.random() * (max - min + 1)) + min;
    },
    items: ['itemA', 'itemB', 'itemC', 'itemD']
};
wordRandomizer.run(document.body);

The code works fine in Chrome but in FireFox the button shows very small and doesn't work and in IE the code doesn't work at all.

Answer 1

The problem is here:

button.innerText = 'Change Item';

innerText is not a valid DOM property. It may be supported by some browsers, but it's non-standard, and should not be used.

You can replace innerText with either:

• textContent (which is the direct standards-compliant equvalent),

or with

• innerHTML (which is a bit different, but will be identical in your example, and is compatible with older browsers)