Question

我正在练习一些代码并遇到一些错误，任何人都可以帮助我。

显示如下错误：

SyntaxError：期望表达式，得到关键字＆＃39;否则＆＃39;

以下是代码

var ageJohn = 25;
var heightJohn = 165;

var ageSmith = 60;
var heightSmith = 180;

var ageMalli = 24;
var heightMalli = 170;

var scoreJohn = heightJohn + 5 * ageJohn;
var scoreSmith = heightSmith + 5 * ageSmith;
var scoreMalli = heightMalli + 5 * ageMalli;


if (scoreJohn > scoreSmith && scoreJohn > scoreMalli); {
    console.log('John wins with ' + scoreJohn);
} else if (scoreSmith > scoreJohn && scoreSmith > scoreMalli); {
    console.log('Smith wins with! ' + scoreSmith);
} else(scoreMalli > scoreJohn && scoreMalli > scoreSmith); {
    console('Mary wins with ' + scoreMalli);
}

Answer 1

您还有一个;。错误在这里：

} else if (scoreSmith > scoreJohn && scoreSmith > scoreMalli); {

更改为

} else if (scoreSmith > scoreJohn && scoreSmith > scoreMalli) {

另外两行如果有类似问题

Answer 2

删除“;”应该是：

if (scoreJohn > scoreSmith && scoreJohn > scoreMalli) {
   console.log('John wins with ' + scoreJohn);
} else if (scoreSmith > scoreJohn && scoreSmith > scoreMalli) {
   console.log('Smith wins with! ' + scoreSmith);
} else(scoreMalli > scoreJohn && scoreMalli > scoreSmith) {
   console('Mary wins with ' + scoreMalli);
}

Answer 3

你不应该有;在你的if语句之后，删除它应该可以正常工作。

    if (scoreJohn > scoreSmith && scoreJohn > scoreMalli) {
        console.log('John wins with ' + scoreJohn);
    } else if (scoreSmith > scoreJohn && scoreSmith > scoreMalli) {
        console.log('Smith wins with! ' + scoreSmith);
    } else(scoreMalli > scoreJohn && scoreMalli > scoreSmith) {
        console('Mary wins with ' + scoreMalli);
    }

Answer 4

试试这个：

var ageJohn = 25;
var heightJohn = 165;

var ageSmith = 60;
var heightSmith = 180;

var ageMalli = 24;
var heightMalli = 170;

var scoreJohn = heightJohn + 5 * ageJohn;
var scoreSmith = heightSmith + 5 * ageSmith;
var scoreMalli = heightMalli + 5 * ageMalli;


if (scoreJohn > scoreSmith && scoreJohn > scoreMalli) {
    console.log('John wins with ' + scoreJohn)
} else if (scoreSmith > scoreJohn && scoreSmith > scoreMalli) {
    console.log('Smith wins with! ' + scoreSmith)
} else if(scoreMalli > scoreJohn && scoreMalli > scoreSmith) {
    console('Mary wins with ' + scoreMalli);
}

我从if语句中删除了分号并修复了最后else if

Answer 5

你有一些语法错误。

if (scoreJohn > scoreSmith && scoreJohn > scoreMalli) {
    console.log('John wins with ' + scoreJohn);
} else if (scoreSmith > scoreJohn && scoreSmith > scoreMalli) {
    console.log('Smith wins with! ' + scoreSmith);
} else if (scoreMalli > scoreJohn && scoreMalli > scoreSmith) {
    console('Mary wins with ' + scoreMalli);
}

你的其他条款不能有条件，你应该把它扩展到另一个，如果。

Answer 6

if语句的语法就像;

if (condition or Boolean value)
    statement;
else
    statement;

statement必须是复杂的{...} 您在;之后编写了(condition)，因此if子句以空语句结束这就是为什么，else会引发语法错误。谢谢你的阅读。

SyntaxError：期望表达式，得到关键字＆＃39; else＆＃39;

6 个答案: