JavaScript RangeError 参数不是有效的代码点

如果 NaN 值、负整数、非整数或其他大于 0x10FFFF 的值与String.fromCodePoint()方法一起使用，则会发生此 JavaScript 异常Invalid code point 。

信息：

RangeError: {0} is not a valid code point (Firefox)
RangeError: Invalid code point {0} (Chromium)

错误类型：

RangeError

错误原因： String.fromCodePoint()用于返回使用指定为参数的代码点序列创建的字符串。如果传递的代码点值为 NaN 值、负整数、非整数或大于 0x10FFFF 的值，则会引发此错误。

示例 1：此示例可以正常工作而不会引发任何错误，因为传递给该方法的值是有效的。

HTML

    
        
        
    
    
        
            GeeksforGeeks
        
  
        
            JavaScript RangeError 
            Argument is not a valid code point
        
  
        
            click here
        
        
  
        
            var el_down = document.getElementById("GFG_DOWN");
            function Geeks() {
                try {
                    String.fromCodePoint(34);
                    el_down.innerHTML = 
                      "'Argument is not a valid code point'" +
                      " error has not occurred";
                } catch (e) {
                    
                    // Show the error in console
                    console.log(e);
                    el_down.innerHTML = 
                      "'Argument is not a valid code point'" +
                      " error has occurred";
                }
            }
        
    

输出：

示例 2：在此示例中，传递给方法的值为NaN ， 这是一个无效值，因此发生了错误。

HTML

    
        
        
    
  
    
        
            GeeksforGeeks
        
  
        
            JavaScript RangeError 
            Argument is not a valid code point
        
  
        
            click here
        
        
  
        
            var el_down = document.getElementById("GFG_DOWN");
            function Geeks() {
                try {
                    String.fromCodePoint(NaN);
                    el_down.innerHTML = 
                      "'Argument is not a valid code point'" +
                      " error has not occurred";
                } catch (e) {
                    // Show the error in console
                    console.log(e);
                    el_down.innerHTML = 
                      "'Argument is not a valid code point'" +
                      " error has occurred";
                }
            }
        
    

输出：