圣杯布局！！！

Question

圣杯布局里给left的盒子加个magin-left:-100%;盒子就会跑到上面，为什么？

求大牛指教下，谢谢！

Answer 1

GPYHWTWLBEUADZCSOLIYUERHJMHXORAKTZUSOKHDTVFAZBXSBEVYOETPSAXGCGBXUCSVXAJFPYHDGVYNDFURAXGPDSBEHJTJRGCWSNQGPSOXHWQLOJFBRNDTBZURNQMPMILSSOJMCSHPYOEHXXUENXZCFAYIDTJFILBKZLUJGJFOKAQZDMVRAXHIXHQTDDAJGQLBLGAPFVKAPLIRGTVEBQGWFOWGEZOLBJMJMWSWLNDGPYOEUJOKYRKAWWCMCYNKACLIDGDTSBWGPYOQGCQQFOKAJSVYHDUCLMJZWSVSUVLBMOROQNDSIRAQTCFVRHXVXZQMCMBLUJWEGPYJSCRBDHPFCXFWSHXMCEGJRNQBEHKCSPYOKADTPYEFOENWSPSOXODZPLGJZCLIXTISUXAPXHXZILIRNDNWZIPLUKEUKTCMBPCLISBKNQTIDAIKMQFPLBXGVLUKAVKTWYYCLZBYUYHKMQZOMIKAQSIYOQZPLOKAKAWJEUXTJZCRGIVCMPLVXUXTWFOLOKZJMWSTXMPTPFADZPLPKAXTJGJZPLFUYOQAWGOKGIRHXNJFUDTCWKZDUFOEHXANWGCLVYAXTCWLUDNDYVRBKEGWGVRHQTPFUXMPGCFVRUQAVSIDTDSIRHQZCLBEVMOYUUWFCRNDAPMUXMBEAWZVYOKPSUSNKGPLIQRTJEUEUWMVENWSBEHDZUKMRHWSDMIJSIYYBDTPSBEHEMDMVLUWZOKAWYTJLIEAQGCFRBJTWZBRURMKGCZOKBKUQZLUKMPSBLUKAFOYOLURUWEOIWMJKNQFHEACEGQFCEIETCDFVRHPZILIEKAVSOENDAJSSHKNKTDGQTPOEGDFJZBLOIFBXNJMISHRNXFPYAXTAQTQ

Answer 2

当左边距为负的时候，盒子就左移。盒子正好又处于一行的最左边，再左移就是向上一行左移。如果负的长度大于盒子本身的长度，盒子就会一直左移，直到碰到父元素的边缘

Answer 3

-100%?一般不要这么布局，magin本来就容易塌陷，你还用负值更容易塌陷了。

Answer 4

是不是没有清除浮动