1.6 KiB
1.6 KiB
title | localeTitle |
---|---|
Using Objects for Lookups | 使用对象进行查找 |
使用对象进行查找
这是一个例子:
// Setup
function phoneticLookup(val) {
var result = "";
// Only change code below this line
switch(val) {
case "alpha":
result = "Adams";
break;
case "bravo":
result = "Boston";
break;
case "charlie":
result = "Chicago";
break;
case "delta":
result = "Denver";
break;
case "echo":
result = "Easy";
break;
case "foxtrot":
result = "Frank";
}
// Only change code above this line
return result;
}
// Change this value to test
phoneticLookup("charlie");
这是一个解决方案: 我们在这里不做任何改动:
function phoneticLookup(val) {
var result = "";
我们需要将switch语句转换为对象。将所有case
值传输到对象属性:
function phoneticLookup(val) {
var result = "";
var lookup = {
"alpha": "Adams",
"bravo": "Boston",
"charlie": "Chicago",
"delta": "Denver",
"echo": "Easy",
"foxtrot": "Frank"
};
After converting our case statements into object properties you can make use of the variable result
to let the function return the correct value.
JavaScript的 result = lookup \[val\]; \`\`\`
·在[repl.it上](https://repl.it/@AdrianSkar/Using-objects-for-lookups)运行代码。
### 资源
* [“JavaScript对象基础” - _MDN JavaScript参考_](https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Objects/Basics)