Question

我正在尝试为此代码创建一个if语句，以仅允许具有经验级别1-3的记录显示但不确定如何执行此操作？这是部分代码，如果需要更多让我知道。

var table = document.getElementById('blueteam');

        table.innerHTML = ""; //Clears table
    if(explevel < 4){
        for (var i = 0; i < firstnames.length; i += 1) {
            var row = table.insertRow(0);
            var cell = row.insertCell(0);
            cell.innerHTML = firstnames[i] + " " + lastnames[i] + " Exp:" + explevel[i];
        }
    }
    };

Answer 1

请尝试以下代码：

var table = document.getElementById('blueteam');

    table.innerHTML = ""; //Clears table

    for (var i = 0; i < firstnames.length; i += 1) {
        if(explevel[i] >= 1 && explevel[i] <= 3){
            var row = table.insertRow(0);
            var cell = row.insertCell(0);
            cell.innerHTML = firstnames[i] + " " + lastnames[i] + " Exp:" + explevel[i];
        }
    }
};

如果explevel < 4您正在通话，但由于explevel是一个列表（explevel[i]），您无法做到。相反，请检查explevel的每次迭代。

Answer 2

var table = document.getElementById('blueteam');

    table.innerHTML = ""; //Clears table
    var count = records.length;
    var record;
    for (var i = 0; i < count; i++) {
        record = records[i];
        if (reecord.explevel < 4) {
            var row = table.insertRow(0);
            var cell = row.insertCell(0);
            cell.innerHTML = record.firstname + " " + record.lastname + " Exp:" + record.explevel;   
        }
    }

我修改了数据。我不确定firstnames，lastnames和explevel。我希望那些应该出现在record。

中

示例数据

var records = [{
    "firstname": "",
    "lastname": "",
    "explevel": ""
}];

Answer 3

您可以使用逻辑AND (&&)运算符： https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Logical_Operators

var table = document.getElementById('blueteam');

table.innerHTML = ""; //Clears table
for (var i = 0; i < firstnames.length; i++) {    
    if((explevel[i] >= 1) && (explevel[i] <= 3)){
        var row = table.insertRow(0);
        var cell = row.insertCell(0);
        cell.innerHTML = firstnames[i] + " " + lastnames[i] + " Exp:" + explevel[i];
    }
}

在我的JavaScript代码上使用if语句的问题

3 个答案: