some time ago, I encountered such a question in the interview:
var num=0;
for(var i=0;i<10;iPP)
{
var num=1;
num+=i;
}
console.log(num);numnumconsole.lognum09
some time ago, I encountered such a question in the interview:
var num=0;
for(var i=0;i<10;iPP)
{
var num=1;
num+=i;
}
console.log(num);numnumconsole.lognum09 first, the final answer should be 10;
reason:
1. The repeated declaration of variables will be ignored, but the assignment will not, so each cycle your num starts with 1
2.i < 10
is 10 
this loop and var num = 0; in fact, it's in a function, and the for method itself is not a function, is it?. And try to output 10
because the code block is equivalent to a thing at the same level
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