function enjoy1(){ var num1=100; } enjoy1(); console.log(num1);//报错:num is not defined
1、
function enjoy2(){ var num2=100; window.num2=num2; } enjoy2(); console.log(num2);//100
2、
function test(){ var age=19;//局部 return function(){ console.log(age); } } var func=test();//获取局部变量,这一步不可少 func();//19
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