JS实现 输入框回车后跳到下一个，和只准输入数字

window.onload = function () {
    //阻止按回车按钮后提交表单的问题
    document.getElementsByTagName("form")[0].onkeydown = function () {
        if (event.keyCode == 13) { return false; }
    };
    var inputs = document.getElementsByTagName("input");
    var index = 1;
    for (var i = 0; i < inputs.length; i++) {
        if (inputs[i].type == "text" && inputs[i].style.display != "none" && inputs[i].getAttribute("disabled") != "disabled") {
            //给页面上的没有隐藏的文本框设置tabindex顺序值，下文按tabindex顺序跳转
            inputs[i].setAttribute("tabindex", index);
            //监听onkeydown事件,输入回车时实现跳至下一文本框
            inputs[i].onkeydown = goNextInput;
            index++;
        }
    }
};

function goNextInput() {
    if (window.event.keyCode == 13 ||  window.event.keyCode == 9) { //录入回车时才往下一录入框跳
        //下一个录入框的tabindex值
        var nextIndex = parseInt(window.event.srcElement.getAttribute("tabindex")) + 1;
        var inputs = document.getElementsByTagName("input");
        for (var i = 0; i < inputs.length; i++) {
            if (inputs[i].type == "text" && inputs[i].style.display != "none") {
                var tabIndex = inputs[i].getAttribute("tabindex");
                if (tabIndex != null) {
                    var index = parseInt(tabIndex);
                    if (typeof index == "number" && !isNaN(index) && index == nextIndex) {
                        inputs[i].focus();
                    }
                }
            }
        }
    }
}

 function typeText(a) {
        var m = "";
    if(a.value.substring(0, 1) == "-")
     m = "-";
var str = (a.value.replace(/[^0-9.]/g, '')).replace(/[.][0-9]*[.]/, '.');
if(str.substring(0, 1) == ".")
str = "0" + str;
a.value = m + str;
//只输入整数和小数
//onkeyup="value=value.replace(/[^\d{1,}\.\d{1,}|\d{1,}]/g,'')"  
}

以上这些直接copy到js文件，然后在需要的html页面头文件<script src="js/myxm.js"></script>包进去就行了，因为是window.onload函数，且都getby的是form和input的TagName