SOURCE

//全局变量的声明
text = "全局变量";

    function bl() {
      text1 = "我也是全局变量";
      var text2 = "我是局部变量";
      console.log(text2); 
    }
    bl() 
    console.log(text); 
    console.log(text1); 

//局部变量的声明
function b2() {
      text1 = "我也是全局变量";
      var text2 = "我是局部变量";
      console.log(text2); 
    }
    b2()