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combination.html
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combination.html
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<html>
<body>
<script type="text/javascript">
function println(str){
document.write(str);
document.write("<br />");
}
function print(str){
document.write(str);
}
function printArray(array){
print("print Array: ");
for(i=0;i<array.length;i++){
print(array[i] + " : ");
}
println("");
}
//index: current position
function combination(array, index, num, result){
if (num == 0){
for(j=0;j<result.length; j++){
print(result[j] + " , ");
}
println("");
return;
}
if(array.length == index) return;
result.push(array[index]);
combination(array, index+1, num-1, result);
result.pop();
combination(array, index+1, num, result);// take care,NOT increase the num, since result hasn't contain the num, or it will lose many number
}
function printAllCombination(){
var value = document.getElementById('inputArray').value;
var array = value.split(',');
var result=[];
for(i = 1; i < array.length; i++){
println("combination num is: " + i);
combination(array, 0, i, result);
}
}
/*
var input = ['1','2','3','4'];
var length = input.length;
println("length: " + length);
for(i = 0; i< length; i++)
{
println("input[i]: " + input[i]);
}
printAllCombination(input);*/
</script>
<input id="inputArray"> <<---- Input the array,separated by comma</input>
<input type="button" onclick="printAllCombination();" value="Calculate Combination">
</body>
</html>