[英]How to check if a value has been passed on to a javascript function or not
[英]How to check which argument has been passed to a function
我想調用另一個jQuery函數並傳遞另一個參數-我傳遞的參數取決於傳遞給原始函數的參數的名稱。 所以我可能會有這樣的事情:
matchedNumbers1 = compareArrays(userNumbers, winningNumbers1, matchedNumbers1);
matchedNumbers2 = compareArrays(userNumbers, winningNumbers2, matchedNumbers2);
matchedNumbers2 = compareArrays(userNumbers, winningNumbers3, matchedNumbers2);
//COMPARE INPUTTED ARRAY OF NUMBERS TO WINNING ARRAYS OF NUMBERS
function compareArrays (userInput, winningNums, matches) {
matches = 0;
allMatchedNumbers.length = 0;
$(userInput).each(function(i) {
$(winningNums).each(function(j) {
if (userInput[i] == winningNums[j]) {
allMatchedNumbers[matches] = userInput[i];
matches++;
}
});
});
switch (winningNums) {
case 'winningNumbers1':
alert("!!!!!");
markMatches(ListItems1);
break;
case 'winningNumbers2':
markMatches(ListItems2);
break;
case 'winningNumbers3':
markMatches(ListItems3);
break;
}
return matches;
}
希望上面的代碼可以清楚說明我要做什么。 我嘗試使用switch
語句,但這僅比較值,而不比較傳遞給函數的原始參數的名稱。 任何幫助,將不勝感激。
即使可以,您也不應該這樣做。 只需將您要匹配的數組作為另一個參數傳遞即可:
function compareArrays(userInput, winningNums, matches, listToMark) {
...
markMatches(listToMark)
}
function winningNumbers1(){
var result = 1;
return {result:result, fname: 'winningNumbers1'};
}
function winningNumbers2(){
var result = 2;
return {result:result, fname: 'winningNumbers2'};
}
function compareArrays (userInput, winningNums, matches) {
var result = winningNums ? winningNums() : null;
if(result)
switch(result.fname){
case 'winningNumbers1':
// action
break;
case 'winningNumbers2':
// action
break;
}
}
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.