时间picker 去掉起始限制

@@ -250,8 +250,6 @@ Page({
       placeholder: '出生日期',
       mode: "date",
       fields: "day",
-      start: '1970-01-01',
-      end: '2018-01-01',
       onChange: 'onPickerSelect',
     },
     beforemarryData: {
@@ -296,7 +294,6 @@ Page({
       mode: "date",
       fields: "month",
       datelong: 0,
-      start: '1970-01-01',
       end: (new Date()).getFullYear() +'-'+ ((new Date()).getMonth()+1),
       // start: (new Date()).getFullYear() + '-09-01',//'1970-01-01',
       // end: (new Date()).getFullYear() + '-09-01',
@@ -313,7 +310,6 @@ Page({
       onChange: 'onPickerSelect',
       mode: "date",
       fields: "month",
-      start: '1970-01-01',
       // start: (new Date()).getFullYear() + '-09-01',//'1970-01-01',
       // end: (new Date()).getFullYear() + '-09-01',
       // onTap: 'studyDataTap'
@@ -328,7 +324,6 @@ Page({
       onChange: 'onPickerSelect',
       mode: "date",
       fields: "month",
-      start: '1970-01-01',
       // start: (new Date()).getFullYear() + '-07-31',//'1970-01-01',
       // end: (new Date()).getFullYear() + '-07-31',
       // onTap: 'studyDataTap',
@@ -345,7 +340,6 @@ Page({
       onChange: 'onPickerSelect',
       mode: "date",
       fields: "day",
-      start: '1970-01-01',
       datelong: 0,
     },
     identifytypeData: {
@@ -432,7 +426,6 @@ Page({
       onChange: 'onPickerSelect',
       mode: "date",
       fields: "day",
-      start: '1970-01-01',
       datelong: 0,
     },
     firstpaybackDate_2: {
@@ -446,7 +439,6 @@ Page({
       onChange: 'onPickerSelect',
       mode: "date",
       fields: "day",
-      start: '1970-01-01',
       datelong: 0,
     },
     leasestartDate: {
@@ -460,7 +452,6 @@ Page({
       onChange: 'onPickerSelect',
       mode: "date",
       fields: "day",
-      start: '1970-01-01',
       datelong: 0,
     },
     leaseendDate: {
@@ -474,7 +465,6 @@ Page({
       onChange: 'onPickerSelect',
       mode: "date",
       fields: "day",
-      start: '1970-01-01',
       datelong: 0,
     },
     loandatelongData: {