ES6 逻辑运算符

var avg = 20;
var percentage = 90;

console.log("Value of avg: " + avg + " ,value of percentage: " + percentage);
var res = ((avg > 50) && (percentage > 80));

console.log("(avg>50)&&(percentage>80): ", res);
var res = ((avg > 50) || (percentage > 80));

console.log("(avg>50)||(percentage>l80): ", res);
var res = !((avg > 50) && (percentage > 80));

console.log("!((avg>50)&&(percentage>80)): ", res);