话不多说,直接上代码:
function grade(grade){
switch(true) {
case grade>=90:
console.log('A'); break;
case grade>=80:
console.log('B'); break;
case grade>=70:
console.log('C'); break;
case grade>=60:
console.log('D'); break;
default:
console.log('E'); break;
}
}