访问不使用变量的对象
访问不使用变量的对象
提问于 2019-03-20 03:28:02
这看起来很简单，但我却碰壁了。我的代码获取权重，访问对象数组以获取一个值，然后使用该值* weight计算结果。但是访问对象不能与变量一起工作。
function calc(){
var gender;
if(document.getElementById("male").checked){
gender = "mensList";
} else if (document.getElementById("female").checked){
gender = "womensList";
} else {
alert("Please select a gender");
return false;
}
var kg = parseInt(document.getElementById("bwKg").value);
var grams = parseFloat(document.getElementById("bwGrams").value);
var bw = parseFloat(kg + grams);
var lifted = parseFloat(document.getElementById("liftWeight").value);
var theValue = womensList[bw]; // This works
var theValue = mensList[bw]; // This also works
var theValue = gender[bw]; // This doesn't work
var theValue = gender + "[\"" + bw + "\"]" // Nor this
var result = theValue * lifted;
document.getElementById("result").textContent = result;
}
var womensList = {
40.0: "1.4936",
40.1: "1.4915",
40.2: "1.4894",
40.3: "1.4872",
40.4: "1.4851",
// ......... etc
150.7: "0.7691",
150.8: "0.7691",
150.9: "0.7691"
};
var mensList = {
40.0: "1.3354",
40.1: "1.3311",
40.2: "1.3268",
40.3: "1.3225",
40.9: "1.2975",
// ......... etc
205.7: "0.5318",
205.8: "0.5318",
205.9: "0.5318"
};回答 2
Stack Overflow用户
回答已采纳
发布于 2019-03-20 03:35:55
在您的代码中，您正在将一个变量设置为string not gender。
if(document.getElementById("male").checked){
gender = "mensList";
} else if (document.getElementById("female").checked){
gender = "womensList";
}应该是
if(document.getElementById("male").checked){
gender = mensList;
} else if (document.getElementById("female").checked){
gender = womensList;
}Stack Overflow用户
发布于 2019-03-20 03:35:21
这就是你的问题：
if(document.getElementById("male").checked){
gender = "mensList"; //gender now contains a string only..
} else if 因为性别只包含一个字符串，所以这将不起作用：
var theValue = gender[bw]; // This doesn't work相反，你应该做的是：
if(document.getElementById("male").checked){
gender = mensList; //now gender contains an array provided mensList is defined beforehand ..
} 页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/55248668
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