var x,y;
y = 1;
x = y + 1;
console.log(x);
//結果會得出x為2
//因為x,y是可變的所以稱為變數，在js code x,y需要定義如上
//這裡定義函式1加到10
function sum1to10(){
var result = 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10;
return result;
}
//呼叫函式
var call = sum1to10();
console.log(call);
//這裡定義函式1加到10，採用傳入輸入參數
function sum1to10ByArgs(start,end){
var result = 0;
for (var i = start;i <= end;i++){
result = result + 1;
}
return result;
}
//呼叫函式
var callResult = sum1to10(1,5);
console.log(call);
//用if ... else判斷傳入的變數是:1或2或3
function checkNumber(no){
if (no == 1){
console.log("傳入1");
}else if (no == 2){
console.log("傳入2");
}else if (no == 3){
console.log("傳入3");
}else {
console.log("傳入的值超出範圍:1~3");
}
}
checkNumber(2);
//改用switch ... case判斷傳入的變數是:1或2或3
function checkNumberBySwitch(no){
switch (no){
case 1:
console.log("傳入1");
break;
case 2:
console.log("傳入2");
break;
case 3:
console.log("傳入3");
break;
default:
console.log("傳入的值超出範圍:1~3");
}
}
checkNumberBySwitch(3);
//字串相加
function addString(name){
return "Hello " + name;
}
console.log(addString("Louis"));
console.log(addString("Stanely"));
//字串比較，大小寫是不一樣的
function checkString(name){
if (name == "Louis"){
console.log("你是Louis");
}else{
console.log("你不是Louis");
}
}
//首字母小寫
checkString("louis");
//首字母小寫
checkString("Louis");
//array feature
const _ = require("lodash");
var arrayObj = [1,2,3,4];
var result = _.find(arrayObj,function(item){
return item == 2;
})
console.log(result);
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