2d限幅.ewb

EWB经典实用列子

@C87<FD4L@H9@:@@LID54><6H6D=@5H183@70G<80I0B034B44<E8<@I@3<6H=LM8
I08DJL<L;@N44D1D;4J@MH50F@104DO<IDA@OD=8H8<HOLMDB<6<FH@8846<=<L0H
4@8L4A<306@<4F@00ID;0D08H9DK0M@1LO00L$000@80D@04040<8@0<0D4080<81
L>LJ8I054N<4D1D;4J@=H?D2438DH7098BDGD=0F4H0?46<FL:8>@J000>4N<;0>8
@0B0A4:H<49HC4F<;848LH0LC@E0EH38N<@HIDC<78>8H4JL7H687L48O8:LM@@<N
<>H64;L2HM4:H?<<HH0A@<D241D1<JHJHC0G4;<L4F4@HIDMD@@6<?@G0MD>0082L
FHMLF<14C<MDA<9@ID10K8ADC@H0@DD00L4D9D@D>0K0GL7H2L=@:08@;@H07L$00
0@80@0B@H<3H201D2@J8G43@L0G@C40<48AD1H3840>0@0C004488HID=HF@28><I
8C@9D1DC4JLE0042<EDKLC06L=@KHJ@B4;<5L4024C<KD944<DLI@BL6@<@:4G<ND
8D=0C0L850:D<4F89<IH<<A4642<6HG<JHAD9@L0H45H645<F84@HDA0A4M8<L=8C
<C0H0@@B0=LC<3440=HH84@L@44C<C@442<C8H0@<CD<88HN86014CLID1<H@G0G4
MD<<GH3068@40LK<ID7@383@4024KD98489<9@30E03HN01L$000@M8I004B40H0@
1@201D2@@000A47DK@944<DLI@BL6@<@:4G<ND8D=0C0L850:DNHD8HD08LLIDK@9
8J4840<8@I@2L40>8@0C0A4:H<89HC4F<E4<40<@@I@?8E8?4BDC0<DG@BDC8=0@D
HHG@<4N<2HL8FHHLMDI474G438N8DH1D;@68;4E@C4D0@@B48<HL94CDFH0L8D4<4
HFH>484B0@H9HC86L=HFLK8I@7D6<L<<H7<6<=0L858;014H<DH9H3420>8>@H@H@
7<DDI43<68<DK0:@>4;<GDJ46888F<54>@H8J0E46<2LHD9@:8I8C09488F@3D204
8E02@=4080D@H90F86LFDF0A@GDND<@903874<<M8BH:LJL<HB<K8;L><<D9H30K4
=DM43DD<0D4L<4K8B@AD?LJ8JH<<<4A@N45LE4<8=@JL;8C03<CDIH=8<D;89H9L6
07LHH4060;@DHH<A8C4G4HD>024F<ADC4K8O0FH?D60<0FH48L<4H9D2L<<M4L<B0
;<00B@MD><6<DH5@F8ADNL8@1@C<F@8<286L<HKH8HG@M8JLFHLDE<0L306@>0J@G
0<40<4H54F854=0KHK@>4?8D8;0@460N8HH1D;D1H3@E<7D4H<4H@B8988HD0>H:H
;82074=4F4987LD06@?8L<D@2H64F4I08H4D1LC@F850I@6H>@0@B<=<J<K@A0K4@
L2<J<C@H@;@5@@L48?838N01L$000@8090044448A0C@6@<4K0A000J4800410B0?
@C0B88H9L3420=480F@A0:42<JL@H983HG0=40<2<JL<@I03<6H=LL@KH4D@HAD3<
64O<>0<8C8NDLDFDA@<D:<@@9DC46H<DK@J0C45<BDNHJ83@E<E01D;@784LK8NH8
0144<@LAHB<78=D1L<D8H9H9@C<6L><J8J094N<HH=DL<>@I@K@5D74=0JH0L1H34
6@I408:H1<A4G88D8LAHAHC070?<6@?48<DH1@C<58=H=<=0MH34<<;<9DD42<@H9
HCDG4?0<<9054<<4H14J450A44H8H54=DGHH0@48<6L78B8A4=<@8LLI<3<6<<HML
;81864N8=H;@;HM4A<>D<0L<I@F014><6H7HA0A49D4HIDBLF4@D38K448ADN<>0K
8G0B4B<2HDD9<34G@DD485@IHDH:@B0B8G0C4K<F0G824?8O08@A@N4ODL82D:4L0
F0K4IHADC@8@=L90HDA<647824=L8468F<ID1894F074AD30;HO8H@7<C8D01<C<2
D0LH<0HIHA8D<A4:47D843L64;@<8?0289LELC090KDI894K0886@1@A8<49@K0=0
IH989@9@ED4@=HE<089HK44L=HM09@?4:<8LIHC0F8;<N050M0B@B4I<10A@<0H@C
H60<<:4D0?@B<C8@@747<4<H@H@>L@4@84HI@C@F8?0?8MH44B<<H1HCD6L8H<8D8
D@<84H4H<8E8AD0DO@0<$000@D0D0146<DL1@107440<0@0=0D0000@907HB0946<
@LIH3<4<6880D@HDNL644<D<94C0F<:LA<A4MLA8C098;L;HJ<J4B06L=DL0J808?
<I4:8:0H8I0D4L<D@9HK<@<HL8@0@LDIDC@6@>@J8G@>4K<503D6<AL54HL1D3<40
>0K0G0942HF028@H9DKDOD?8NLC8@8A4N<:LB<6L<@I8F0E4L8FHG8LH78><J@>H9
HH8F@ED1H54408@A04@3<9DD42<@H9HCDG4?0KD9054<<4H14J4:@B828B<E01D24
B<L0@@HD4@64<0K0E@3L3<6H64H4F<;4<8H8<88H=@=<K0=@082<>8NHD014@<7D=
HE87D>0FH14G<K<>4H8BDFHND882@2808802@?808B02<4H04H0K42HAHC<A0<@1<
?D0430N8H@A42<C430<<L064B<FH98I0?@B40448=0?D@8AL14=HH@@@D01404OL$
000@80@0O@60@D9H3078>DLH@0900<080HA00H18KDN4@<B@68<HB820=D0L@@A04
49LC@70C444B8M@@@HL9@C868=@I0?@B40448=0?DH04@38NDLDJ4B06L=DL0J85H
?<I4A@D0@@B48<HL94CDFH0L6@4<4LDHIDC<74=4M0D@?4L<FH>478<HMHA43060>
8J000@40<8H9@F8@8BD60=@M8B@04448L8L9@C@2<C8G@44;<K8E8G0EDN4=DAD=L
1DC<34<@<8E@JHLH1<3@70>@L@;HA84HEH14CH5L=LI@C0GDM<;HHLD@K4@0G@J83
0M<H@HHC4<42<LHI@;@B@<@J8?@34;<90B05DJ8701LDLAD3<74=4:4G8B@H4;<58
H8L8=@181HL8E0;4>@>8<858@8@L70<8D8A44<E0:870;HM0<42D2<9HA@><14644
<90281@HD1@ALA0>8L0=@LL8HA@C<D04@KH90D04H?080>@J8O8@0?L$000@8080?
46<4L1DCD6@=LK@@090D<<<0H103040<8H@H0K4JHAD306L806@:00008D@3HE@@@
<4:<DL1@107478<8KHCHM0J8L@1DC468=@E8G0EDF4G4LLA@=D6D@D9H3078>D=LA
<=<48DDA@C44@8@K<0444<8I02<4L9H=0A04@7<L464B<FH98I0?@B40448=0?DH0
4@38NDLDJ4B06L=DL0J85H?<I4A@D0@@B48<HL94CDFH0LB@2<J<2DID0@70=H@8B
L14<8H8<088F8F4C0:06H:LJ8I0546<:L?82<4HG4?<:L:@<<H4?43<JLJ05@A@><
H@G8=D9HC4F<K81<0L103<6HJ<1HHH9@F8K<C06L=@KHJ@B4A<FL>L@8O4B8@H5@G
HA<K<FDN00D5H1@?@1<ELE<1<3@C8A0=HH8G4C<<8DHCLADC@BLI0O4G@DL4H4@3@
442<JDB44@;488H8B4N4I09D8@8L8H7H6<<H3H:@1@C0>43<9D109<20A4<4L4>DC
<ID2<5LD4301H2LFLI4K@8D6<=@@8AD7<04OL$000@J8I0540<D8@4082040><K09
<IL7D>0KHI@04B48H0L1D206H80H@0064N<4LJ4=49HC4F<=44D0<0@IH8HK44@O<
A@?4H<LH9D3DG41D0404B<=@>8NLO0GHD@44?<2LC8<@2L6L=LI06H0H1HA040408
@I02094K<N@LDJ4;D30KD>40<<@34A0642<2L5H>D=4F4I4A4M41<CL9<64;D14BL
H@@@C09<>0;8H4E0MHA@D8D4M<18C0B0><LDK8B<1498I8@DCH9<<H@0E0A4M@IHC
D4L2<=@KD244<DHG42<=0:0:0I@O0G<=L4HB89<H<G8G<>@6LK4K@5H74@L:86464
:03D58AH0@O@0<$000@I0B@O4080L8@202048<0A000J4800410B074N@LDJ4CD6@
>8I8J85H?<M4G40LIHC<7440J8M0D00448HH1@20687LH04@;<ID54><6HGD>06H1
@0@IH6HKLH0=@F41H<@DH:01@C8<@CD64=LK0G@E44<FL9H>4C4HL0L;LJ8B0HD>L
>4N<BH3D282<HDD4F894L8<H1HCD54<DM0J094L<>HGL=<9<H8?49DM8F0=D80J<O
8544<2LJD<89DAL?H7LI04@;<:H2H3@58?4L048>@F428@H9DKDDHI4AD?H7LH0>0
046<;<D8KDB@F4ND:L:H:D0<<8LH2H4@F8DH4860:8HLIDC04<<DK@H8L@;49@1@:
LH8K0BDN05<DL0H9@8L980HBLDL9DK<889L9HKHN<=0A4I4D@A8C<6@>@H<1L68B4
7DN4<@IHC06@=@K0G@=DLL1D;@<@JH@8=8JHF8C4K@K<1@<LH4H@G4:<6DC80864=
8KH=84H=L942LDDJ4:<2HHLAHJ@;L88<<908@?L20148<4LM@>4CHN@BH?H?40@60
L<3LC0?8A8E48L=494B05<ADM0I83<74<@<4201LJ@187L4<2<GDF4KDH<;@=4M0D
@5D2@N4@@74>LDD>4M<5H74>8L@4@O<:8;L:8C<J@A@6HJDND@@>8=43458>8M8J0
848<4DA@30FHI07828N8LH1DC<48?0L0I01DA82<E07DCD@DC4F<2H;4389@KHC@9
46<4HM0EHI8D<2L3DODID1D><MDLHB8444<DHM42H@<6H8<K0G@34F<:HA0GDL4@0
?L$000@38500004:81L:0H8J0D4:<8HAH3<208480A0H0@<2L?<200428@@I81@<4
F<<H1HJ@G84<B8HH1HA06@40<0J88H?D>D5@C<5<=4K@B0?4><4LA43<6<=LDDH0;
H;810I8C<74=4M0D@?4;<KHJ8M0A084N<0@<H@0B0B40<@@AD3468;<B0>40<8@A<
3<74C<KL0HI@C<I0@0K4F0C0EDFH943@>484:H@074>@9L3<4DGH4H>DK0:HD04H<
DFLN@44:H;DA@C0:D;@CH<8J8>H:LKHI044><D@=@O@KHN0F8;H;HI4:H9@KHC@94
6<4HA0C<60=@N8M0BDI@N40DE0I0E48<0L1DBD60<8K0B@>DFLC4K0=H88KHB0JD7
H703<6LB<M@N<<@IHC06@=@K02HC<64=LL0=87LC0K0?@:4O8K4;@8L7064NH60:8
HLID;0FH4L5H><J4F@MD644LID3@E<=DJD54A<D@0H4<=LM8I094G<34O49L>@>H:
@<@A@I0542<0L<@?DHD@004B<<0?<D8:<2D6L=4M0:H;8;8J8N<7D9HM8F@84288H
9HK<G<L@4@G<;05D?L>@DHA@143<FDB<6@7@4<D0146<DL9@JD5HF8O07H9@J8G05
4><8@9H3070=0J4?874ADH@@848B4OH0H3<28:H1@AL=8@854>@9<0@;D6H4<<8;L
FH7H4HN@O8?00<BLN<50F<484H<8=<IH<H4HDHJLCD68<DL0:0I40<2L84@LE<9H9
@34G46D;8CLBH649HF@30@DL88@G41H146<<8ID?490=4N@J88004OL$000@80@0N
@D49L0<@DO024B46@><M0G@B48<4LID3<6L40G4HD;H?8MHC4884L=@?D30B4:<4H
1H107440<848NHE4L84H1DCD7440J8@0@0A4=<NH0H5HLL:4<H8D9@H@JHC@ID9@9
@EL7<<DI8H0D4B80L9H;4?@>89HM8F@24:<8H=HADJH<L>8E@=@9@5LE<1DD06<<D
9@30FHI42<L<7H4<64CHK0=DB02434:DLHB@44A<9LCH;<ML6H305H>8<8H8?48<D
HI@;@N8ALJ4MH=H9<D<2LH4HD90:8ELDHF@<D2<;0B@J0B@6L>DL@A@=D8@:0=@H8
5<34KL889834F<=0;DD0BH70E0O<F4E@FD5D;0N8D8N46LEH7L@8CLFDI<B468=HM
<4DM@K0A4A<C81808J@?818J<DH1@KD2<AD9H:40D=8I0C<6H>0KH:H@D3<G8105H
LLE@24;@C8GHLHKD:04D88D<48=HI048FH94L8<HA@;@7@9<=<G8>H5DCH?LB42@8
@<@90306L<4K0L@C4B<2H@45HE09014L8B@=@ADA45L503@?4BH6DFLAD;D0L9LL0
0H100L6D04OL$000@80@0J@H<3H201D2@N8G<DL98B84440J8@0B0A4M<64@D9H30
74>@E0D@=4:<0H@@3@2060N4CDKHH0LD8H5H<0H0A0A4=<CHHHND:00H9HBD74<DI
03H4L6HLL6@@<N84HAD3<78><=L2D0<4H:8N<L@?@6@64I8F@@0:42<JLE@9430G@
>0H@58GDB<5LEH9LB0G8HD68ADLH98EHC0=H?DA4:DB0D4@D24CD6@=LK@I@4DK<<
<:D=L9D34B4:<4H5H98B0F@:<2D6L=4=D:84@4D><7H<D:HH@8@=HIH;4IDH@>HG<
:<FHI0:0I40<DL5@984@9HM8F@24:<8HEH9DA@4H2DE<1DD86<<D9@306H<D<4J04
43D:4B42<FHH06<;<;<8HM8G0343<ODJ<L830CD4D>46<LD9D3D74<<5<4L50IH5<
:HKHF05D<0IH48@@L4L@1D;4@@88:8I8C08DM<N8D@1H;DF@=0E4C<D0:HB068;89
<H@;<:@6L4HG4D@O0N@J<L<50;81LDD=07DBHH8=DE4D44D8@9H346L>@N408BHH@
1DK@48B<D@1DC@68<@H8G034A<H0I<C<2@CH=H8HJ8G0443<N<I@HD0LC@GH646H=
84<44=LM0D0HDFDDDA8C0;808LHD@D4B<HH=H;L;H:@DDH8H0@D@0?L$000@I0B@0
4240@0@1@201D2@@000E40L54<DI@70?4A<J8LD943D78:<KHJ@B46<2HD41LB444
40J8@0A0946H30N8DH1DC@6L=HI8G0D4A<5L6@@D9H3074>@A@I0542<0L@@;@;@?
DK8DLA8C<6@>@LHCH706HB<6L>074AL685<<848FHLH=@<H<8?8KD54:<0H1HBD7@
>0I8L8B<><:8DLADC068>8=<F@7HB<<<<D<<?8;4=D<0H46<4H1@C<F870M<NDLD:
4J<88GLDH@H2H5<6H=L=4ELGD50647D644<DDAHK<8@4DB<=@8DLD=DDDI414L<>H
742L1H6D641H5D?H<@N4MH4<B8<H1H3D74=4H@J@D4B<FHC@48K038A44LA0BH48F
LHD5@ILC@F@10>8D4484DA0:<F86D8HK0@8H8B4LLAH=@M@3@N<0@=HO@6HBL=@AD
64=H9LBD4@8<N40H2@NHD0B8DH=D1@A4A4:@G4BD3<G4@0042<L<M4OD?4L<N0;4B
DG450;8JH<H:0KHD@>48<2LA4E<A4C@9D7<5D<0<88@7<:L@DH41<8LE@J83<ALCL
E<DL=HF46@MD98EHC0MHB@7H4<G<FLN0E43H0HD@@D1LA4L488=8K0B03@2HD@8L8
880;@><8D8@H07L$000@H8F0540<481DA0304038500004:81L?D?49D8L:@I8F@@
4:<8H9H3078>DL@B@C4>8DL9@34G0F@K0;H68K<2@C4884LA@3@7840L@@0B0>42<
KLE0A03<F8A0=DB8G034K<30G470GL7<;40L;8:8<0B8?DC@G@44;<5@@8L8;8203
428HH=D24I86<4LID;@G@2DE09014L8B@=@ADI44<504H9L9@4<E8@DC0K<HHB@>4
8<LL143@78=4KHFH9@FHHH30FDDL98B8D4<L4D2<JLJ<O8D4B8DH9DK45DAHA46@C
DKHH0LD8H5H<0H0H@70>D?LKHG03H1<E858><I8B0HD?<;HC<84?4B<FH<@K8=@60
B4C84LLLI0E@9@1<306D>4IDC8@@H41<8LE@J83<5LD0E<DL=HF49@D<G4B85<581
D8H>H=LL4:<GD6D<D8@9HC4G05084J89H:DK@D@D4A<40N0E8<@IHDLI@A8C0I0ID
74E<C4K0MHD47H58?4L0B@8DA4H@94CD6H<8I8I0FDA45D:D;@6<E<1DD46<<D5@K
@N0B0=43@2DB4B4=0240HO8@L@LKHL4D4=L?0M0343HO8@D@D;H>4N@14O00L$000
@2@@000E4@L40>DM0G@C488DL1@C@74:DLHB@440<481DA0304038J8;H9HKHB054
6<BLO@MD4DKL7D:<J8M054?<0H60I44H?D?49D8L:LKHI0C48<<L90K0189LE<<82
8D4N8@H9D3474<4K@A@ED3L7440=8L8?D;@<8>4:41DED4<6H<4M048O0@01838G4
HD0L=D@<I0CH40HH9H8@I<BHC<60=@N8I@946<2LCL84:0;038GD@48<4LID3<FLN
030AL9H3074>@A@BHF<G0O0F0I49H:DK@D@D4A<20>4K8:L=0IHDLI@A8C0I0ID74
E<C4K0=H>LI8B@@48<4D1L;@0@ODEHA078=DH@B@B4=<9H1HDLH0H@>HF<K84078:
<HH2H2@<DN4E@A0H0@DF874484L1@3@F@FDB@H@ADC4FL:8C@J0JD2@6@=LMHG04D
?D5L;49@94J<DHMH7@G03@CHL8L@9<<@8@BL<@64305H14ELJH9HC<68;LLH=H<<=
<EL0D1@C@F@:<30F4ADEH94=D2<8<4H=D6<0HID;4D81D9DD8=D;4F0?<AHB8684H
H@>@DH=D<@284@8@DHA@C4F0D4<H88K4M4602LD4<<@8EH743060<02864KHLD5H:
8BL6<=DJ8G08D>438C@6@>HL@B@LD4@A4K8FL4D5@9860A4C@60=DL08H@D70=LCH
GLJHHH4H44<L1HC878=HM018G4287H5@50K8HH9068=H283DK@G@=4A<ML40:L4<D
@3D04OL$000@80K0>48<LL1D3<20>880H@50J<08@H1D201D2@@000C40<CD6H<4N
098B<C88@2<6@>8I8I@84N<HD=HMDJ4GDJL1@BL8@4L64=LI0B@O4L8DH9HC<5L>0
KHD@EDG@7440J8JH101@C0F@;<C0G8LDM<E<<<G@5L5HA05L<DK@@@24?<:LD82H;
DJ@2@M8D@34?<0LC4N@8L4HID3@70=@H8L@O4N80H1H;D9HB8A010=H>45D4L>8J8
C@74:<8H5H7HK4186L@L5HFH6DJ4I<IDK<I810;<90=8<<K8<DI@3<6L>HK0D@=4B
<@H5HEHI<K<88F<9@C4O4J8DH9@C<6L>8N8L8=@;LH4I8@@44;<J8K<18K<48@89<
HH2H@DF@BDADM<<8FHO8HH2H@<408<>4=4M05D?D=LGHD@>4;<NHGHMH6LF8;0FDB
LM8K87H1@G0NL4<:<6HJ8D<94?<JL?HIDBLJD8<8@2470FL@DK8JLN04L5HM4@8D0
IHK@581<3<O4B4ADHDLHA@5D7H<DK@<85D2H:H88C<A<F<543@I@A<;H7LJ8104<J
H>H8D<4O8N@8HMH>@DH=DO4DD=42<=D1<2H6H64N4GHGD@DI@;<J@H@>DD034M84L
F0N01H6HF4149L=0<DM@J0AD9@B4O@9DN@9HE830=8GDF<:05D=8EH4@;448L@48@
L5@1H3DL@I@84:<HL5D38@HIDB46<2H9D5L<4HHA@HDL8@<C0G@LD<H5HCH<LKH7@
@4B<:@?D9H:8@0C@7@:@KH1@?4J<FH>HCD40E4I068:0LHM@J@1LO00L$000@I86@
548<0LID3<6840J8@0A004D8@4082040?<O8<HO<N@5LL03L$!9f875502