/**
 * Created by admin on 2016/7/25.
 */
function set_font() {
    // 璁＄畻銆佽浆鎹㈠竷灞€鍗曚綅
    var html = document.getElementsByTagName('html')[0];

    var designFontSize = 100,
        designWidth = 750;

    function setFontSize() {

        
        var winWidth=document.documentElement.getBoundingClientRect().width;
        if(winWidth>=751){
             winWidth = 750;
         }else{
             winWidth = document.documentElement.getBoundingClientRect().width;
         }
        var fontSize = winWidth / designWidth * designFontSize;

        html.style.fontSize = fontSize + 'px';
    }

    setFontSize();

    window.addEventListener('resize', function () {

        setFontSize();
    });

    return this;
}

set_font()