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[蝬脤隡箸沘 Javascript 批遣eval()隤瘜

[銴鋆賡包
頝唾唳摰璅撅
璅銝
潸” 2014-12-3 22:00:25 | 芰閰脖 撣 |摨閬 |梯璅∪
砍敺 media 2014-12-3 22:31 蝺刻摩
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eval() 臭貊嗆頞撘瑕之銝摰寞閫賢嚗雿典祕典云撘瘀啣神 Javascript 蝬撣豢雿輻典啜
eval evaluates 蝪∪神嚗舐其撠銝亥店瑕箔靘憒嚗
var n=3;( t! U& z4 L* H# Q. X7 x& u: W
var b=5,c=6;
- k6 D4 q8 e) }3 B  z+ M: heval('a'+n+'=b*c');
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銝靘嚗 eval() 銝剔摮銝莎撅霈
a3=b*c
% f& x1 r. ~2 E, J, W
瘝荔蝯撠望 a3=b*c嚗銋撠望航 a3 蝯 30
曹靘舐伐eval() 舀銝銝脣銝莎嗡隞支瑁嚗銝血箇嚗撖虫嚗刻株銝刻撱嚗靘憒隞乩臭遢蝪∪株殷

+ S  n3 p( x! w
撠閮
Q1 P1 T1
Q2 P2 T2
Q3 P3 T3
0 a5 u* E# |3 F; h9 o2 P
敺箸祉閮殷甈雿敺舀雿蝔梧喳之憭貉身閮撣恬賣靘摮嚗函楊靘脰銝蝑貉格雿賢嚗銝舀甈雿函賢嚗憿舐內嚗刻撓交賊桀孵嚗撠閮閬質芸閮蝞嚗銋撠望荔
T1=Q1*P1 T2=Q2*P2 隞亙 T3=Q3*P3
閮剝隞質”桀 order嚗隞伐
document.order.T1.value=document.order.Q1.value*document.order.P1.value;) z! @8 i  @+ ]! @# z! o- x
document.order.T2.value=document.order.Q2.value*document.order.P2.value;+ V- T2 n% V- l, z" O( s
document.order.T3.value=document.order.Q3.value*document.order.P3.value;
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雿臭舀喟 for 靘頝餈游嚗舀荔T1;Q1 鈭甈雿蝔曹游刻嚗暻潸餈游g嚗eval() 撠望晷銝典港嚗eval() 貊批捆嗥瑁嚗靘摮暻澆詨g
蝚砌 T 潛潛洵銝 Q 潔隞亦洵銝 P 潦嚗 eval()嚗
var form=document.order;
+ j# [7 J5 |, l% o; afor (var i=1;i<=3;i++){6 V5 ~1 i' q. X6 c% ]8 @7 t
eval('form.T'+i+'.value=form.Q'+i+'.value(form.P'+i+'.value');
) p' L% N0 _0 F9 ~* _}

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eval() 鋆∠摮銝莎i 澆亦 1,2,3 憟伐蝯W神銝憭找葡銝銵銝璅∩璅
銝舐典改

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