fix:bug[18529] 修改密码未能作最少8位校验

@@ -200,6 +200,7 @@ struct ModifyPasswordPage {
             .width('100%')
             .height(`${this.calcHeight(80)}lpx`)
             .backgroundColor(this.btnStatus ? '#ED2800' : '#99ED2800')
+            .enabled(this.btnStatus ?true:false)
             .borderRadius('4vp')
             .onClick(() => {
               if(this.btnStatus){
@@ -227,7 +228,7 @@ struct ModifyPasswordPage {
   }
 
   inputTextChange(){
-    if ((this.password_old.length >= 6 && this.password_old.length <= 20) && (this.password_new.length >= 6 && this.password_new.length <= 20)&& (this.password_new_repeat.length >= 6 && this.password_new_repeat.length <= 20)) {
+    if ((this.password_old.length >= 8 && this.password_old.length <= 20) && (this.password_new.length >= 8 && this.password_new.length <= 20)&& (this.password_new_repeat.length >= 8 && this.password_new_repeat.length <= 20)) {
       this.btnStatus = true;
     } else {
       this.btnStatus = false;