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javascript2

代码变化一:
<script> function abs(){ var x; if(x>0){ return x; } else{ return -x; } } console.log(abs(-9));// NaN </script>
代码变化二:
<script> function abs(x){ //var x; if(x>0){ return x; } else{ return -x; } } console.log(abs(-9));// 9 </script>
代码变化三:
<script> function abs(){ //var x; if(x>0){ return x; } else{ return -x; } } console.log(abs(-9));// ReferenceError: x is not defined if(x>0){ </script>
代码变化四:
<script> function abs(){ //var x; if(x>0){ return x; } else{ return -x; } } console.log(x=-9);// -9 </script>
代码变化五:
<script> function abs(x){ //var x; if(x>0){ return x; } else{ return -x; } } console.log(x=-9);// -9 </script>
代码变化六:<script>    function abs(x){        //var x;        if(x>0){            return x;        }        else{            return -x;        }    }    abs(-9);    console.log(x=-9);//  -9    </script>

 

javascript2