键值对查找

// 定义 phoneticLookup
function phoneticLookup(val) {
var result = "";

var lookup={
"alpha":"Adams",
"bravo":"Boston",
"charlie":"Chicago",
"delta":"Denver",
"echo":"Easy",
"foxtrot":"Frank"
};
result=lookup[val];
return result;
}

phoneticLookup("charlie");