var arr = [{
name: "John Doe"
}, {
name: "jamal"
}, {
name: "Badr"
}, {
name: "mohsen"
}]
arr.forEach((val) => {
firstLetter = val.name.split(" ")[0].split("")[0];
});
for (var i = 0; i < arr.length; i ) {
if (firstLetter == "J" || firstLetter == "j") {
console.log("Goodbye " arr[i].name);
} else {
console.log("Hello " arr[i].name);
};
};uj5u.com熱心網友回復：
在您的代碼中，當您覆寫它的值firstLetter時，它只有最后一個值。m將代碼更改為：
var arr = [{
name: "John Doe"
}, {
name: "jamal"
}, {
name: "Badr"
}, {
name: "mohsen"
}]
const firstLetter = [];
arr.forEach((val) => {
firstLetter.push(val.name.split(" ")[0].split("")[0]);
});
for (var i = 0; i < arr.length; i ) {
if (firstLetter[i] === "J" || firstLetter[i] === "j") {
console.log("Goodbye " arr[i].name);
} else {
console.log("Hello " arr[i].name);
};
};uj5u.com熱心網友回復：
如果我理解正確，您想對以orval.name開頭的名稱說“再見” （對其他人說“你好” ）。沒有必要為此做兩個回圈（做或回圈）。Jjval.nameforEachfor
在任何情況下，您都可以將名稱中的第一個字符稱為 as.name[0]并使用比較運算子或 String 方法來確定名稱是以 aJ還是 a開頭j。
有關此示例，請參見以下代碼片段。
var arr = [{
name: "John Doe"
}, {
name: "jamal"
}, {
name: "Badr"
}, {
name: "mohsen"
}];
arr.forEach((val) => {
if (val.name[0] === "J" || val.name[0] === "j") {
console.log("Goodbye " val.name);
} else {
console.log("Hello " val.name);
}
});uj5u.com熱心網友回復：
你不需要在forEach之后再回圈，你需要的是檢查具體的名字是否以J/j開頭
var arr = [{
name: "John Doe"
}, {
name: "jamal"
}, {
name: "Badr"
}, {
name: "mohsen"
}]
arr.forEach((val) => {
firstLetter = val.name.split(" ")[0].split("")[0];
if (firstLetter == "J" || firstLetter == "j") {
console.log("Goodbye " val.name);
} else {
console.log("Hello " val.name);
};
});
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標籤：javascript
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