分解质数因子

var m,b,c=0,j=0;
var arr=[];
function fjzys(k){
    
    var i = 2;
    while(k>=i) {
        if (k%i == 0) {
            arr[j] = i;
            k/=i;
            i=2;
            j++;
        } else {
            i++;
        }
    }
    
}

fjzys(100); //求100的质数因子

for(var b = 0; b<(j-1); b++) {
    console.log(arr[b]);    
    console.log(‘*‘);
}

console.log(arr[j-1]);

var num = prompt(‘input your number then i will go on:‘,‘90‘);
    var regex = new RegExp(/^[0-9]*[1-9][0-9]*$/);
    var i = 2;
    var handle = num;
    var arr = new Array();
    while(i<handle){        //i小于num则一直循环下去，直到i=num为止
        var result = handle/i;
        if(regex.test(result)){    //除2结果为整数
            arr.push(i);
            i=2;
            handle=result;
        }else{
            i++;
        }
        if(i == handle-1){    //判断是否要结尾
            arr.push(handle)
            break;
        }
    }
    //打印结果
    var str = String();
    for(i=0;i<arr.length;i++){
        str += arr[i];
        if(i != arr.length-1)
            str += ‘*‘;
    }
    alert(‘the result :‘+str);