火狐、傲游、猎豹、chrome不兼容document.all

http://rebecca.iteye.com/blog/1173548

http://hi.baidu.com/sxjlvwj/item/d45bf2905956810e924f41b2

火狐不支持.innerText(其他浏览器支持但是不支持.all)

<script type="text/javascript">
    function validateCode() {
        var validatevalue = "";
        var codes = new Array(4);
        var colors = new Array("Red", "Green", "Gray", "Blue", "Maroon", "Aqua", "Fuchsia", "Lime", "Olive", "Silver");
        for (var i = 0; i < codes.length; i++) {
            codes[i] = Math.floor(Math.random() * 10);
            validatevalue += codes[i];
        }
        var spans = document.getElementById("divCode").getElementsByTagName("*");
        //var spans = document.getElementById("divCode").all;
        for (var i = 0; i < spans.length; i++) {
            spans[i].innerText = codes[i];
            spans[i].style.color = colors[Math.floor(Math.random() * 10)];
        }
        document.getElementById("validatevalue").value = validatevalue;
    }

    function validate() {
        if (document.getElementById("textfield3").value != document.getElementById("validatevalue").value) {
            alert("验证码错误");
            validateCode();
            document.getElementById("textfield3").value = "";
            document.getElementById("textfield3").focus();
            return false;
        } else {
            return true;
        }
    }
    document.onload = validateCode();
</script>

http://www.cnblogs.com/haimingpro/archive/2012/09/06/2673270.html