闭包作用域问题

相关问题

//闭包参数1  function outer1(){    var i=1;    return function(i) { //i小函数的局部变量 undefined      i++;      console.log(i);    }  }  var getNum1=outer1();  getNum1();//NaN  getNum1();//NaN  getNum1();//NaN  getNum1();//NaN//闭包参数2function outer2(){    var i=1;    return function(i) { //i小函数的局部变量 undefined      console.log(i);      i++;    }  }  var getNum1=outer1();  getNum1();//undefined  getNum1();//undefined  getNum1();//undefined  getNum1();//undefined  //闭包参数3function outer3(){    var i=1;    return function() { //i小函数的局部变量 undefined      console.log(i);      i++;    }  }  var getNum3=outer3();  getNum3();//1  getNum3();//2  getNum3();//3  getNum3();//4