Question

我正在尝试在＆＃34; name＆＃34;中存储的提示中要求输入用户名。 var，如果用户什么都没输入，它会从randomName数组中存储的数组中随机选择一个值。但是它既不返回输入的值也不返回数组中的任何内容，它返回的全部是＆＃34;你的名字是＆＃34;。为什么呢？

到目前为止

var name=prompt("Please enter a usename");
if(name===" "){
    var randomName=["Spill Cramer","Oberon Gorgeous","Pointy Binge","Lord Inquiry","Lower Salmon","Auk Cheeks","Minty Lub","Sonore Dim","African Hernia","Squares Pine","Promise Waterpolo","Cucumber Wizard","Tactful Rampallian","Mars Pawn","Usually Dispatch","Close Baffled","Adaptive Mugger","Involved Neuron","Position Stash","Buttercream Oxidant","Bus Hootenany","Small PHP","Copernicium Hematoma","Nostalgic Relay","Wetsuit Swinhoe"]
    var rand=randomName[Math.floor(Math.random()*randomName.length)];
    if(rand===0){
        alert("Your name is Overfilled Lemon");
    }
    else{
        alert("Your name is "+rand)
    }
}
else{
    alert("Your name is ",name);
};

Answer 1

问题是if(name===" ")只有在用户在提示符中输入空格时才会进入其代码块。将其更改为if(name===""){，它应该可以正常工作。

Answer 2

有一些小问题。以下是工作代码。检查这个小提琴。 https://jsfiddle.net/n6oqx441/

var name=prompt("Please enter a usename");
console.log(name)
if(name=== ''){
    var randomName=["Spill Cramer","Oberon Gorgeous","Pointy Binge","Lord Inquiry","Lower Salmon","Auk Cheeks","Minty Lub","Sonore Dim","African Hernia","Squares Pine","Promise Waterpolo","Cucumber Wizard","Tactful Rampallian","Mars Pawn","Usually Dispatch","Close Baffled","Adaptive Mugger","Involved Neuron","Position Stash","Buttercream Oxidant","Bus Hootenany","Small PHP","Copernicium Hematoma","Nostalgic Relay","Wetsuit Swinhoe"]
    var rand=randomName[Math.floor(Math.random()*randomName.length)];
    if(rand===0){
        alert("Your name is Overfilled Lemon");
    }
    else{
        alert("Your name is "+rand)
    }
}
else{
    alert("Your name is "+ name);
};

Answer 3

从用户体验的角度讲，您可能不希望使用提示作为收集输入的方式。也许您希望查看BootStrap以获得更好的收集输入的方法。

您可能收到错误的原因是，如果用户什么都不输入，则提示的结果实际上为空。

你可能想要做这样的事情：

var name = prompt("enter name: ").trim(); 
if(!name || name === ""){
 //select random name
}

使用trim将删除前导和尾随空白字符，使其更容易进行比较，这意味着如果用户只输入空格，则会为其分配一个随机名称

如何接受此提示的值并将其放入if / else语句

3 个答案: