JS for、while、dowhile三种循环实现金字塔
for循环
for(var i=0;i<5;i++)
{
for(var d=0; d<5-i; d++){
document.write(" ");
}
for(var e=0; e<=i; e++){
document.write("*"+" ");
}
document.write("<br/>");
}
while循环
var length=0;
while (length<5){
let d=0;
while (d<5-length){
document.write(" ");
d++;
}
let e=0;
while (e<=length){
document.write("*"+" ");
e++;
}
document.write("<br/>");
length++;
}
dowhile循环
var i=0;
do {
let d=0;
do {
document.write(" ");
d++;
}while (d<5-i)
let e=0;
do {
document.write("*"+" ");
e++;
}while (e<=i)
document.write("<br/>");
i++;
}while (i<5)
