我正在處理一個代碼，我有一個問題：與 的循環(huán)不適用于 while。這意味著在 i = 0 運行后，執(zhí)行腳本，然后代碼停止。期望：代碼可以在 i= 0，1，2，3 的情況下連續(xù)運行，依此類推。那么我怎么能修改代碼以這種方式工作，請幫助，非常感謝。function FOLDER_SCAN_ONLY() { // List folders inside the folder var ss = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("scan_results") var sheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("folder_to_scan"); var startRow = 2; var numRows = sheet.getLastRow(); var dataRange = sheet.getRange(startRow, 1, numRows, sheet.getLastColumn()); var data = dataRange.getValues(); for (var i = 0; i in data; i++) { var rowData = data[i]; if (!rowData[1]) continue; if (rowData[2] != 'OK') continue; if (rowData[3] != '') continue; var folder_id = rowData[1]; var parent = DriveApp.getFolderById(folder_id) var childFolders = parent.getFolders(); while (childFolders.hasNext()) { var childFolder = childFolders.next() var data = [ childFolder.getName(), childFolder.getUrl(), childFolder.getId(), childFolder.getParents().next().getName() ]; // Write ss.appendRow(data) sheet.getRange(2 + i, 4).setValue('done') } }}
2 回答
天涯盡頭無女友
TA貢獻1831條經(jīng)驗 獲得超9個贊
while 循環(huán)僅在條件為 true 時運行，但它將從 for 循環(huán)的每個周期至少檢查一次。如果您希望它每次都運行，則可以將其更改為 do while 循環(huán)。我不完全確定你想完成什么，但你絕對可以在for循環(huán)中放置一個while循環(huán)。
for(let i = 0; i < 5; i++){
console.log('Starting a cycle');
let bool = true;
let value = 0;
while(bool){
console.log('While loop');
if(value === 3){
bool = false;
} else {
value += 1;
}
}
}
當(dāng)執(zhí)行時，這將為您提供一個示例 -
Starting a cycle
While loop
While loop
While loop
While loop
Starting a cycle
While loop
While loop
While loop
While loop
Starting a cycle
While loop
While loop
While loop
While loop
Starting a cycle
While loop
While loop
While loop
While loop
Starting a cycle
While loop
While loop
While loop
While loop
因此，如您所見，while 循環(huán)將運行 for 循環(huán)的每個周期 - 假設(shè)它的條件為 true。如果條件在第一個 while 循環(huán)中變?yōu)?false，但再也不會變?yōu)?true，則在 for 循環(huán)的所有未來周期中，將跳過 while 循環(huán)。
例如，如果我們稍微更改代碼.
let bool = true;
for(let i = 0; i < 5; i++){
console.log('Starting a cycle');
let value = 0;
while(bool){
console.log('While loop');
if(value === 3){
bool = false;
} else {
value += 1;
}
}
在本例中，我們?yōu)?while 循環(huán)設(shè)置了一次條件，但從未將其更改回默認(rèn)值?，F(xiàn)在我們得到...
Starting a cycle
While loop
While loop
While loop
While loop
Starting a cycle
Starting a cycle
Starting a cycle
Starting a cycle
互換的青春
TA貢獻1797條經(jīng)驗 獲得超6個贊
您可以使用這兩個循環(huán)，它們的行為可能與預(yù)期不同。
function forWhileLoop(){
for (let i=0; i < data.length; i++){
loop = true
console.log(`processing: ${i}`)
while (loop == true){
console.log(`loop is ${loop}`)
loop = false
console.log(`loop is ${loop}`)
}
}
console.log('all done')
}
forWhileLoop()
// Results in
processing: 0
loop is true
loop is false
processing: 1
loop is true
loop is false
processing: 2
loop is true
loop is false
processing: 3
loop is true
loop is false
processing: 4
loop is true
loop is false
processing: 5
loop is true
loop is false
processing: 6
loop is true
loop is false
processing: 7
loop is true
loop is false
processing: 8
loop is true
loop is false
processing: 9
loop is true
loop is false
all done
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