haslayout详解_html/css_WEB-ITnose

WBOY
Release: 2016-06-24 11:36:09
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定义

  haslayout是IE7-浏览器的特有属性。hasLayout是一种只读属性,有两种状态:true或false。当其为true时,代表该元素有自己的布局,否则代表该元素的布局继承于父元素。
  [注意]通过element.currentStyle.hasLayout可以得出当前元素的hasLayout情况

 

默认触发hasLayout的标签 

  【1】html,body
  【2】table,tr,th,td
  【3】img
  【4】hr
  【5】input,button,select,textarea,fieldset
  【6】frameset,frame,iframe

 

触发hasLayout的CSS属性

  【1】display:inline-blcok
  【2】height/width:除了auto
  【3】float:left/right
  【4】position:absolute
  【5】writing-mode(IE专有属性,设置文本的垂直显示):tb-rl
  【6】zoom(IE专有属性,设置或检索对象的缩放比例):除了normal

 

【IE7专有的触发hasLayout的CSS属性】

  【1】min-height/max-height/min-width/max-width:除none
  【2】overflow\overflow-x\overflow-y:除visible
  【3】position:fixed

  

用途

  【1】解决IE7-浏览器下父级边框不阻止子级上下margin传递的bug

<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>Document</title><style>body{    margin: 0;}ul{    margin: 0;    padding: 0;    list-style: none;}.list{    border: 10px solid black;    background-color: red;    /*触发hasLayout*/    /*float:left;*/}.in{    height: 100px;    width: 100px;    margin-top: 50px;    background-color: blue;}</style></head><body><ul class="list">    <li class="in"></li></ul></body>    </html>    
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  【2】配合display:inline让块元素模拟inline-block

<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>Document</title><style>body{    margin: 0;}.box{    width: 100px;    height: 100px;    background-color: red;    display:inline-block;    /*配合display:inline触发hasLayout*/    /*     float:left;    display:inline; */}</style></head><body><div class="box" id="box"></div><span>测试inline-block用</span></body>    </html>            
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  【3】解决在IE7-浏览器下LI4px空隙bug(IE7-浏览器下li有高度或宽度或zoom:1,且仅包含内联元素,且内联元素被设置为display:block,li下会多出3px的垂直间距)

<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>Document</title><style>body{    margin: 0;}ul{    margin: 0;    padding: 0;    list-style: none;}.list{    width: 200px;    background-color: lightgreen;}.in{    height: 100px;    background-color: lightblue;}.span{    display: block;    zoom:1;}</style></head><body><ul class="list">    <li class="in">        <span class="span">1231</span>    </li>    <li class="in">        <span class="span">1232</span>    </li></ul></body>    </html>        
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  【4】触发浮动元素的父级的hasLayout,浮动元素会被layout元素自动包含,相当于IE7-浏览器下实现清浮动

<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>Document</title><style>body{    margin: 0;}ul{    margin: 0;    padding: 0;    list-style: none;}.list{    background-color: lightgreen;    height: 200px;}.in{    float: left;    width: 100px;    height: 100px;    border: 1px solid black;    background-color: lightblue;}.test{    width: 100px;    height: 150px;    background-color: yellow;}</style></head><body><ul class="list">    <li class="in"></li>    <li class="in"></li></ul><div class="test">测试浮动</div></body>    </html>            
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