下面的代码还将检查PASTE事件。 取消“ruleSetArr_4”的注释，并在“ruleSetArr”中添加(concate)以允许浮点数。 简单的复制/粘贴功能。用参数中的input元素调用它。 例如:inputIntTypeOnly($('输入[name = " inputName "] '))

function inputIntTypeOnly(elm){ elm.on("keydown",function(event){ var e = event || window.event, key = e.keyCode || e.which, ruleSetArr_1 = [8,9,46], // backspace,tab,delete ruleSetArr_2 = [48,49,50,51,52,53,54,55,56,57], // top keyboard num keys ruleSetArr_3 = [96,97,98,99,100,101,102,103,104,105], // side keyboard num keys ruleSetArr_4 = [17,67,86], // Ctrl & V //ruleSetArr_5 = [110,189,190], add this to ruleSetArr to allow float values ruleSetArr = ruleSetArr_1.concat(ruleSetArr_2,ruleSetArr_3,ruleSetArr_4); // merge arrays of keys if(ruleSetArr.indexOf() !== "undefined"){ // check if browser supports indexOf() : IE8 and earlier var retRes = ruleSetArr.indexOf(key); } else { var retRes = $.inArray(key,ruleSetArr); }; if(retRes == -1){ // if returned key not found in array, return false return false; } else if(key == 67 || key == 86){ // account for paste events event.stopPropagation(); }; }).on('paste',function(event){ var $thisObj = $(this), origVal = $thisObj.val(), // orig value newVal = event.originalEvent.clipboardData.getData('Text'); // paste clipboard value if(newVal.replace(/\D+/g, '') == ""){ // if paste value is not a number, insert orig value and ret false $thisObj.val(origVal); return false; } else { $thisObj.val(newVal.replace(/\D+/g, '')); return false; }; }); }; var inptElm = $('input[name="inputName"]'); inputIntTypeOnly(inptElm); <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script> <input type="text" name="inputName" value="1">

您可以尝试使用" 'onkeydown " '事件并取消事件(事件。preventDefault或类似的)当它不是允许的键之一。

下面的代码还将检查PASTE事件。 取消“ruleSetArr_4”的注释，并在“ruleSetArr”中添加(concate)以允许浮点数。 简单的复制/粘贴功能。用参数中的input元素调用它。 例如:inputIntTypeOnly($('输入[name = " inputName "] '))

function inputIntTypeOnly(elm){ elm.on("keydown",function(event){ var e = event || window.event, key = e.keyCode || e.which, ruleSetArr_1 = [8,9,46], // backspace,tab,delete ruleSetArr_2 = [48,49,50,51,52,53,54,55,56,57], // top keyboard num keys ruleSetArr_3 = [96,97,98,99,100,101,102,103,104,105], // side keyboard num keys ruleSetArr_4 = [17,67,86], // Ctrl & V //ruleSetArr_5 = [110,189,190], add this to ruleSetArr to allow float values ruleSetArr = ruleSetArr_1.concat(ruleSetArr_2,ruleSetArr_3,ruleSetArr_4); // merge arrays of keys if(ruleSetArr.indexOf() !== "undefined"){ // check if browser supports indexOf() : IE8 and earlier var retRes = ruleSetArr.indexOf(key); } else { var retRes = $.inArray(key,ruleSetArr); }; if(retRes == -1){ // if returned key not found in array, return false return false; } else if(key == 67 || key == 86){ // account for paste events event.stopPropagation(); }; }).on('paste',function(event){ var $thisObj = $(this), origVal = $thisObj.val(), // orig value newVal = event.originalEvent.clipboardData.getData('Text'); // paste clipboard value if(newVal.replace(/\D+/g, '') == ""){ // if paste value is not a number, insert orig value and ret false $thisObj.val(origVal); return false; } else { $thisObj.val(newVal.replace(/\D+/g, '')); return false; }; }); }; var inptElm = $('input[name="inputName"]'); inputIntTypeOnly(inptElm); <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script> <input type="text" name="inputName" value="1">

使用这个DOM

<input type='text' onkeypress='validate(event)' />

这个脚本

function validate(evt) {
  var theEvent = evt || window.event;

  // Handle paste
  if (theEvent.type === 'paste') {
      key = event.clipboardData.getData('text/plain');
  } else {
  // Handle key press
      var key = theEvent.keyCode || theEvent.which;
      key = String.fromCharCode(key);
  }
  var regex = /[0-9]|\./;
  if( !regex.test(key) ) {
    theEvent.returnValue = false;
    if(theEvent.preventDefault) theEvent.preventDefault();
  }
}

这里是一个非常简短的解决方案，不使用已弃用的keyCode或，不阻塞任何非输入键，并使用纯javascript。(在Chromium 70.0.3533, Firefox 62.0和Edge 42.17134.1.0中测试)

HTML:

<input type="text" onkeypress="validate(event)">

JS:

function validate(ev) {
    if (!ev) {
        ev = window.event;
    }

    if (!ev.ctrlKey && ev.key.length === 1 && (isNaN(+ev.key) || ev.key === " ")) {
        return ev.preventDefault();
    }
}

下面的函数将检查每个输入字符是否为number。

numeric: value => {
    let numset = new Set(['0', '1', '2', '3', '4', '5', '6', '7', '8', '9']);
    console.log(numset.has(value.substring(value.length - 1, value.length)));
}