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                            ### 為根元素`html`計算`rem`
*****
具體原理，可查看**響應式布局 / 類型二**：http://www.hmoore.net/vvmily_king/vvmily/2331773
```

????(function?(doc,?win)?{

        vardocEl?=?doc.documentElement,
        
        resizeEvt?=?'orientationchange'inwindow???'orientationchange'?:?'resize',
        
        recalc?=?function?()?{
        
        varclientWidth?=?docEl.clientWidth;
        
        if?(!clientWidth)?return;
        
            docEl.style.fontSize?=??(clientWidth?/?375)*100?+?'px'; // 375：設計稿尺寸
        
        };
        
        if?(!doc.addEventListener)?return;
        
        win.addEventListener(resizeEvt,?recalc,?false);
        
        doc.addEventListener('DOMContentLoaded',?recalc,?false);

})(document,?window);
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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