<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document
</title>
</head>
<body>
<input type="text" id="row">
<input type="button" onclick="test()" value="确定">
</body>
</html>
<script>
function test(){
var row = parseInt(document.getElementById('row').value);
var mid = parseInt(row/2)+1;
for(var i = 1; i<=row;i++){
if (i<mid) {
var x = 2*i-1;
} else{
var x = 2*(row-i+1)-1;
}
var k = (row-x)/2;
for(var j = k; j > 0; j--){
document.write(' ')
}
for(var s = 1; s <= x; s++){
document.write('*')
}
document.write('<br>')
}
}
</script>
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