在准备验证任何东西时调用此函数。我在这里使用了一个文本框

在我的HTML中:

<input type="button" value="Check IT!" onclick="check(document.getElementById('inputboxToValidate').value);" />

在JavaScript代码中:

function check(num){
    var onlynumbers = true
    for (var i = 0; i < (num.length - 1); i++) {
        if (num.substr(i, 1) != "0" || num.substr(i, 1) != "1" || num.substr(i, 1) != "2" || num.substr(i, 1) != "3" || num.substr(i, 1) != "4" || num.substr(i, 1) != "5" || num.substr(i, 1) != "6" || num.substr(i, 1) != "7" || num.substr(i, 1) != "8" || num.substr(i, 1) != "9") {
            alert("please make sure that only numbers have been entered in the Quantaty box");
            onlynumbers = false
        }
    }
    if (onlynumbers == true) {

        //Execute Code
    }
}

如果你正在尝试有棱角的，这可能会有帮助

获取输入的数字(带小数点)，然后

<input [(ngModel)]="data" oninput="this.value = this.value.replace(/[^0-9.]/g, '').replace(/(\..*)\./g, '$1');">

现在这将不能正确地更新模型中的值 为了显式地改变model的值，添加这个

<input [(ngModel)]="data" oninput="this.value = this.value.replace(/[^0-9.]/g, '').replace(/(\..*)\./g, '$1');" (change)="data = $event.target.value">

更改事件将在模型中的值更新后触发，因此它也可以用于响应式表单。

当涉及到万无一失的用户体验时，人们应该总是尝试保持一个“用户智力”的参考点。

While neglecting everything other than numbers, a dot and a hyphen would seem like the perfect choice, you should also consider letting them enter any content, and when they're done, purify the input; if not a valid number, show error. This method would make sure no matter what the user manages to do, the result will always be valid. If the user is naive enough not to understand the warnings and error messages, pressing a button and seeing that nothing happens (as in keycode comparison) will only confuse him/her more.

同样，对于表单，验证和错误消息显示几乎是必需的。所以，这些条款可能已经存在了。算法如下:

On losing-focus or form-submission, do following. 1.1. Read content from the input and apply parseFloat to result 1.2. If the result is a Non-accessible-Number (NaN), reset the input field and pop-up an error message: "Please enter a valid number: eg. 235 or -654 or 321.526 or -6352.646584". 1.3. Else, if String(result)!==(content from input), change value of the field to result and show warning message: "The value you entered have been modified. Input must be a valid number: eg. 235 or -654 or 321.526 or -6352.646584". For a field that cannot allow any unconfirmed value, then this condition may be added to step 1.2. 1.4. Else, do nothing.

该方法还为您提供了额外的优势，可以根据最小值、最大值、小数点等执行验证。只需要对步骤1.2之后的结果执行这些操作。

缺点:

输入将允许用户输入任何值，直到焦点丢失或表单提交为止。但如果填写说明足够清楚，90%的情况下可能不会出现这种情况。 如果步骤1.3用于显示警告，则可能会被用户忽略，并可能导致无意的输入提交。抛出错误或正确显示警告可以解决这个问题。 速度。这可能比regex方法慢几微秒。

优点: 假设用户有基本的阅读和理解知识，

高度可定制的选项。 工作跨浏览器和独立于语言。 利用表单中已有的功能来显示错误和警告。

再举一个例子，你可以在输入字段中只添加数字，不能添加字母

<input type="text" class="form-control" id="phone" name="phone" placeholder="PHONE" spellcheck="false" oninput="this.value = this.value.replace(/[^0-9.]/g, '').replace(/(\..*)\./g, '$1');">

ReactJS:

<input
    onKeyPress={(event) => {
        if (!/[0-9]/.test(event.key)) {
            event.preventDefault();
        }
    }}
/>

下面是emkey08的JavaScript Wiki答案的一个面向对象的重新实现，它使用了一个EventListener对象实现。(参见:MDN web docs EventListener)

在某种程度上，它可以防止为每个过滤后的输入元素重复匿名事件处理程序函数声明，同时仍然允许它通过可选的回调。

/** * Base input {@see Element} {@see EventListener} filter abstract class * * @implements EventListener */ class AbstractInputFilter { /** * Attach the input filter to the input {@see Element} * * @param inputElement The input {@see Element} to filter * @param isValid - The callback that determines if the input is valid. * @throws Error */ constructor(inputElement, isValid = null) { // Abstract class if (this.constructor === AbstractInputFilter) { throw new Error("Object of Abstract Class cannot be created"); } if (typeof isValid === "function") { this.isValid = isValid; } for (const event of ["input", "keydown", "keyup", "mousedown", "mouseup", "select", "contextmenu", "drop"]) { inputElement.addEventListener(event, this); } } /** * Checks the value is valid * * @callback isValid default call-back that will throw * an {Error} if not implemented by extending this * {AbstractInputFilter} class. * * @param value The value to check * @returns {boolean} * @throws Error */ isValid(value) { throw new Error('must be implemented by callback!'); } /** * Handles the {@see event} dispatched by * the {@see EventTarget} object from the input {@see Element} * to filter its contant while it is being filled. * * @param event the {@see event} dispatched by * the {@see EventTarget} input {@see Element} * @override */ handleEvent(event) { const inputElement = event.currentTarget; if (this.isValid(inputElement.value)) { inputElement.oldValue = inputElement.value; inputElement.oldSelectionStart = inputElement.selectionStart; inputElement.oldSelectionEnd = inputElement.selectionEnd; } else if (inputElement.hasOwnProperty("oldValue")) { inputElement.value = inputElement.oldValue; inputElement.setSelectionRange( inputElement.oldSelectionStart, inputElement.oldSelectionEnd); } else { this.value = ""; } } } /** * Generic Input element {@see EventListener} filter * * @extends AbstractInputFilter * It needs the {@see AbstractInputFilter~isValid} callback * to determine if the input is valid. */ class InputFilter extends AbstractInputFilter {} /** * Unsigned Integer Input element {@see EventListener} filter * @extends AbstractInputFilter */ class UIntInputFilter extends AbstractInputFilter { isValid(value) { return /^\d*$/.test(value); } } /** * Unsigned Float Input element {@see EventListener} filter * @extends AbstractInputFilter */ class UFloatInputFilter extends AbstractInputFilter { isValid(value) { return /^\d*\.?\d*$/.test(value); } } // Filter with pre-made InputFilters (re-use the filter) new UIntInputFilter(document.getElementById("UInt")); new UFloatInputFilter(document.getElementById("UFloat")); // Filter with custom callback filter anonymous function new InputFilter(document.getElementById("AlNum"), function(value) { return /^\w*$/.test(value); }); <label>Unsigned integer: </label><input id="UInt"><br/> <label>Unsigned float: </label><input id="UFloat"><br/> <label>AlphaNumeric (no special characters): </label><input id="AlNum">