想要使用 js 允许 Backspace 或 spcae 按钮

Question

我正在使用此脚本来限制所有特殊字符，但我只想允许 Backspace(8) 和 space(32) 键。

var specialKeys = new Array();
//specialKeys.push(8);  //Backspace
specialKeys.push(9);  //Tab
specialKeys.push(46); //Delete
specialKeys.push(36); //Home
specialKeys.push(35); //End
specialKeys.push(37); //Left
specialKeys.push(39); //Right

function IsAlphaNumeric(e) {
    var keyCode = e.keyCode == 0 ? e.charCode : e.keyCode;
    var ret = ((keyCode >= 48 && keyCode <= 57) || (keyCode >= 65 && keyCode <= 90) || (keyCode >= 97 && keyCode <= 122) || (specialKeys.indexOf(e.keyCode) != -1 && e.charCode != e.keyCode));
    document.getElementById("error").style.display = ret ? "none" : "inline";
    return ret;
}

<input name="pname" list="pnames" id="pname" type="text" class="form-control" autocomplete="off" onkeypress="return IsAlphaNumeric(event);" ondrop="return false;" onpaste="return false;" required/>
<span id="error" style="color: Red; display: none">* Special characters are not allowed.</span>

请帮助我该怎么做..提前致谢

Answer 1

 function IsAlphaNumeric(e) { var k; document.all? k = e.keyCode: k = e.which; var ret = ((k > 64 && k < 91) || (k > 96 && k < 123) || k == 8 || k == 32 || (k >= 48 && k <= 57)); document.getElementById("error").style.display = ret? "none": "inline"; return ret; }

 <input name="pname" list="pnames" id="pname" type="text" class="form-control" autocomplete="off" onkeypress="return IsAlphaNumeric(event);" ondrop="return false;" onpaste="return false;" required/> <span id="error" style="color: Red; display: none">* Special characters are not allowed.</span>