div中iframe高度自适应问题

<span style="color: #008000;">//</span><span style="color: #008000;">window.onresize表示窗口触发时间的时候执行</span><span style="color: #008000;">
//</span><span style="color: #008000;">两个函数，用闭包包裹起来()()</span>
window.onload=<span style="color: #0000ff;">function</span><span style="color: #000000;">(){
    (window.onresize</span>=<span style="color: #0000ff;">function</span><span style="color: #000000;">(){
    </span><span style="color: #008000;">//</span><span style="color: #008000;">获取可见宽度</span>
    <span style="color: #0000ff;">var</span> width=document.documentElement.clientWidth-180<span style="color: #000000;">;//180为左边的div的大小
    </span><span style="color: #008000;">//</span><span style="color: #008000;">获取可见高度</span>
    <span style="color: #0000ff;">var</span> height=document.documentElement.clientHeight-80<span style="color: #000000;">;//80为头部的div的大小可自己修改
    
    </span><span style="color: #008000;">//</span><span style="color: #008000;">如果有宽度就给值，</span>
    <span style="color: #0000ff;">if</span>(width>=0<span style="color: #000000;">){
        document.getElementById(</span>'main').style.width=width+'px'<span style="color: #000000;">;
        
    }
    </span><span style="color: #0000ff;">if</span>(height>=0<span style="color: #000000;">){
        document.getElementById(</span>'sidebar').style.height=height+'px'<span style="color: #000000;">;
        document.getElementById(</span>'main').style.height=height+'px'<span style="color: #000000;">;
    }
})()};</span>

<span style="color: #800000;">html</span>{<span style="color: #ff0000;">
    overflow</span>:<span style="color: #0000ff;"> hidden</span>;
    <span style="color: #008000;">/*</span><span style="color: #008000;">火狐则会去除改变窗口大小时出现的白条这个bug</span><span style="color: #008000;">*/</span>
}