---

//保留数字前面的0
var i2pp1=1
function padding1(num, length) {
  for(var len = (num + "").length; len < length; len = num.length) {
   num = "0" + num;
  }
  return num;
 }
function test1(num, length) {
var i2pp1=padding1(num, length);
//i2pp1=00000001
 }
 //获取变量和需要保留的数字
test1(i2pp1,8);









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