What are the uses of if statements, multi-branch statements, and nested statements in js

The content of this article is about the usage of if statements, multi-branch statements, and nested statements in js. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you. helped.

Classification of if statements:

1, if

2, if else

Code examples:

var score=65;
var daily=70;
if （score>60 &&daily>60）{
alert（"顺利毕业"）
}else{
alert（"很抱歉，没有顺利毕业！"）
}

3. if else if else else

Code example:

/!*Multi-branch if judgment: If there is a branch that meets the conditions, subsequent branches will not be executed. *!/

var score=65;
if （score<60）{
alert（"不及格"）
}else if （score>=60 && score<70）{
alert（"及格"）
}else if （score >=70 && score<80）{
alert（"良"）
}else {
alert（"优秀"）
}

4. Nested if

Code example:

var score=65;
    var daily=70;
    if (score>60 &&daily>60){
        alert("顺利毕业")
    }else{
        if (score <60 && daily<60){
            alert("成绩和考勤不合格，无法毕业")
        }else if (daily<60){
            alert("考勤不合格，无法毕业")
        }else{
            alert("成绩不合格，无法毕业")
        }
    }

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