如何在 JavaScript 中将浮点数转换为整数？

在 JavaScript 中有多种方法可以将浮点数转换为整数。

1. Math.floor（浮动参数）：将作为参数传递的数字四舍五入到向下方向最接近的整数。
   句法：

   Math.floor(value)

     //float value is 4.59;
      var x = 4.59;
      var z = Math.floor(x);
      document.write("Converted value of " + x + " is " + z);

   输出 ：

   Converted value of 4.59 is 4
   

2. Math.ceil（浮动参数）：返回大于或等于给定数字的最小整数。
   句法：

   Math.ceil(value)

     //float value is 4.59;
      var x = 4.59;
      var z = Math.ceil(x);
      document.write("Converted value of " + x + " is " + z);

   输出 ：

   Converted value of 4.59 is 5
   

3. Math.round（浮动参数）：将数字四舍五入到最接近的整数。
   句法：

   Math.round(var);

     //float value is 4.59;
      var x = 4.59;
      var z = Math.round(x);
      document.write("Converted value of " + x + " is " + z);

   输出 ：

   Converted value of 4.59 is 5
   

4. Math.trunc（浮点参数）：通过删除小数位返回浮点数的整数部分。
   句法：

   Math.trunc(value)

     //float value is 4.59;
      var x = 4.59;
      var z = Math.trunc(x);
      document.write("Converted value of " + x + " is " + z);

   输出 ：

   Converted value of 4.59 is 4
   

5. parseInt（浮动参数）：接受字符串并将其转换为整数。
   句法：

   parseInt(Value, radix)
   

     //float value is 3.54;
      var x = 3.54;
      var z = parseInt(x);
      document.write("Converted value of " + x + " is " + z);

   输出 ：

   Converted value of 3.54 is 3
   

6. 双位非 (~~)运算符：将数字舍入为零。如果操作数是一个数字并且它不是 NaN 或 Infinity。
   句法：

   ~~value

     //float value is 4.59;
      var x = 4.59;
      var z = ~~x;
      document.write("Converted value of " + x + " is " + z);

   输出 ：

   Converted value of 4.59 is 4
   

7. 按位或 (|)运算符：将数字舍入为零。
   句法：

   var = value | 0;

     //float value is 5.67;
      var x = 5.67;
      var z = x | 0;
      document.write("Converted value of " + x + " is " + z);

   输出 ：

   Converted value of 5.67 is 5
   

8. 使用 shift (>>)运算符：将数字四舍五入到零。
   句法：

   var = value >> 0;

     //float value is 5.63;
      var x = 5.63;
      var z = x >> 0; 
      //it is same as we are dividing the value by 1.
      document.write("Converted value of " + x + " is " + z);

   输出 ：

   Converted value of 5.63 is 5
   

9. 使用无符号移位 (>>>)运算符将数字舍入到零。
   句法：

   var = value >>> 0;

     //float value is 5.68;
      var x = 5.68;
      //it is same as we are dividing the value by 1.
      var z = x >>> 0; 
      document.write("Converted value of " + x + " is " + z);

   输出 ：

   Converted value of 5.68 is 5
   

10. 通过减去小数部分
    句法：

    var = val - val%1;

      //float value is 5.48;
       var x = 5.48;
       var z = x - x%1;
       document.write("Converted value of " + x + " is " + z);

    输出 ：

    Converted value of 5.48 is 5
    

11. 使用 XOR (^)运算符
    句法：

    var = value ^ 0;

      //float value is 5.49;
       var x = 5.49;
       var z = x ^ 0;
       document.write("Converted value of " + x + " is " + z);

    输出 ：

    Converted value of 5.49 is 5