JavaScript 为什么”0″等于false

在JavaScript中，“0”等于false，因为”0“的类型是字符串，但是当进行等于的比较时，JavaScript会进行自动类型转换，将“0”转换为其数值类型的值0，而我们知道0代表false。所以，“0”等于false。

示例： 这个示例说明了为什么”0″等于false。

<script> 
      
    // JavaScript code to demonstrate  
    // why “0” is equal to false 
      
    function GFG() { 
      
        // Print type of "0" 
        document.write(typeof "0" + "</br>"); 
      
        // Test whether "0" equals to false 
        // or not. If "0" is equal to false 
        // then "0" == false i.e. 
        // false == false which return true 
        var result = ("0" == false); 
          
        // Print result 
        document.write(result + "</br>"); 
          
        // Convert and print "0" to its numeric 
        // value 
        document.write(Number("0") + "</br>"); 
          
        // Convert and print false in numeric value 
        document.write(Number(false) + "</br>"); 
          
        // So both numeric value are same 
        // Therefore condition "0" == false 
        // evaluates to true 
        document.write("0" == false); 
        document.write("</br>"); 
          
        // Or this statement 
        document.write(Number("0") == Number(false)); 
    } 
      
    // Driver code 
    GFG(); 
      
</script>

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