Question

您可以检查我的代码吗？我的if语句中有错误。这是什么意思 SyntaxError：预期的表达式，关键字为“ else”

$ (document).ready(function($)
{
    var sum = 0;
    var numberQA = 4

    $('.skillA:checkbox').click(function()
    {
        sum = 0;

        $('.skillA:checkbox:checked').each(function(idx,elm)
        {
            // idx: index position of selector, elm = this selector,
            sum += parseInt(elm.value, 10);
        });

        // average = sum / numberQA;
        $('#totalSkillA').html(sum);

        if (4 <= sum <=6)
        {        
            $('#communicationSkill1').css({
                "backgroundColor":"#087cb7",
                "color":"white"
            });

        else if (7 <= sum <=10)
        {        
            $('#communicationSkill2').css({
                "backgroundColor":"#087cb7",
                "color":"white"
            });

        else if (11 <= sum <=13)
        {
            $('#communicationSkill3').css({
                "backgroundColor":"#087cb7",
                "color":"white"
            });    

        else if (14 <= sum <= 16)
        {        
            $('#communicationSkill4').css({
                "backgroundColor":"#087cb7",
                "color":"white"
            });
    }
});

Answer 1

您应该对编程进行更多的训练。

4<=sum<=6是错误的。将其更改为4 <= sum && sum <= 6（读JavaScript Operators）

您必须在if和else if块关闭：（读JavaScript if else and else if）

if ( /* condition*/ )
{
    // statements
}
else if ( /* condition*/ )
{
    // statements
}
else
{
    // statements
}

Answer 2

认为您需要像这样的东西

if (4 <= sum <= 6) {
    $('#communicationSkill1').css({"backgroundColor": "#087cb7", "color": "white"})
}
else if (7 <= sum <= 10) {
    $('#communicationSkill2').css({"backgroundColor": "#087cb7", "color": "white"})
}
else if (11 <= sum <= 13) {
    $('#communicationSkill3').css({"backgroundColor": "#087cb7", "color": "white"})
}
else if (14 <= sum <= 16) {
    $('#communicationSkill4').css({"backgroundColor": "#087cb7", "color": "white"})
} else 
{
    ....
}

我不知道这是什么意思SyntaxError：预期的表达式，得到了关键字“ else”

2 个答案: