这是我到目前为止所拥有的。 function onclick() {
var num = parseFloat(document.getElementById("do").value);
if (num <= 0) {
alert("Please enter a bet amount between 1 and 100");
}
else if (num > 100) {
alert("Please enter a bet amount between 1 and 100");
}
var stake = document.getElementById("txtStake").value;
if (stake < num) {
alert("Wrong number Can't Be Higher Than Stake Number")
}
var random = newNumber(1, 7);
if (random == 1) {
document.getElementById("toChangeColor").style.backgroundColor = "red";
}
else if (random == 2) {
document.getElementById("toChangeColor").style.backgroundColor = "green";
}
else if (random == 3) {
document.getElementById("toChangeColor").style.backgroundColor = "gray";
}
else if (random == 4) {
document.getElementById("toChangeColor").style.backgroundColor = "yellow";
}
else if (random == 5) {
document.getElementById("toChangeColor").style.backgroundColor = "brown";
}
else if (random == 6) {
document.getElementById("toChangeColor").style.backgroundColor = "blue";
}
else if (random == 7) {
document.getElementById("toChangeColor").style.backgroundColor = "black";
}
switch (random) {
case 1:
document.getElementById("picture").src = "time.jpg";
break;
case 2:
document.getElementById("picture").src = "pic2.jpg";
break;
case 3:
document.getElementById("picture").src = "pic3.jpg";
break;
case 4:
document.getElementById("picture").src = "pic4.jpg";
break;
case 5:
document.getElementById("picture").src = "pic5.jpg";
break;
case 6:
document.getElementById("picture").src = "pic6.jpg";
break;
case 7:
document.getElementById("picture").src = "pic7.jpg";
break;
}
}
是我做的最小和最大的功能。我真的遇到了麻烦。
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
int isnumeric_array(char *string)
{
while( (char)(*string) != '\0') {
if( !isdigit( (char)(*string) ) ) {
return 0;
}
string++;
}
return 1;
}
int main(){
char grade[128];
float grade2;
read_input:
memset(grade, 0x0, sizeof(grade));
printf("Please, insert a grade between 0 and 10.\n");
printf("Grade: ");
scanf("%s", grade);
if(isnumeric_array(grade) == 0) {
goto read_input;
}
grade2 = atof(grade);
if((grade2 < 0) || (grade2 > 10)) {
goto read_input;
}
else {
printf("You have entered right value\n");
}
system("PAUSE");
}
当我点击一个按钮时，我需要在一个区域中显示5个选项中的随机图片。如何使用开关或循环执行此操作？
答案 0 :(得分：0)
你写切换的情况或者如果是多余的情况，只需在数组或二维数组中制作就会更好。
var bgColors = ['red', 'green', 'yelow'];
var pics = ['time.jpg', 'pic2.jpg', 'pic3.jpg'];
var randomIndex = newNumber(0, 2);
document.getElementById("toChangeColor").style.backgroundColor = bgColors[randomIndex];
document.getElementById("picture").src = pics[randomIndex];