Detailed explanation of HTML5 page rem layout adaptation method-H5 Tutorial-php.cn

Detailed explanation of HTML5 page rem layout adaptation method

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Release： 2018-01-15 09:54:19

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This article mainly introduces the detailed explanation of the HTML5 page rem layout adaptation method. The editor thinks it is quite good. Now I will share it with you and give you a reference. Let’s follow the editor to take a look, I hope it can help everyone.

rem layout adaptation scheme

The main method is:

Dynamic calculation based on the ratio of the design draft to the width of the device And set the font-size size of the html root tag; in
#css, the width, height, relative position, etc. of the design draft elements are converted into values in rem units according to the same proportion. ;
The font in the design draft uses px as the unit and is slightly adjusted through media queries.

1 Dynamically set html tag font-size size

Simplified universal version:

!(function(win, doc){
  function setFontSize() {
    // 获取window 宽度
    // zepto实现 $(window).width()就是这么干的
    var winWidth =  window.innerWidth;
    // doc.documentElement.style.fontSize = (winWidth / 640) * 100 + &#39;px&#39; ;
    
    // 640宽度以上进行限制 需要css进行配合
    var size = (winWidth / 640) * 100;
    doc.documentElement.style.fontSize = (size < 100 ? size : 100) + &#39;px&#39; ;
  }

  var evt = &#39;onorientationchange&#39; in win ? &#39;orientationchange&#39; : &#39;resize&#39;;

  var timer = null;

  win.addEventListener(evt, function () {
    clearTimeout(timer);

    timer = setTimeout(setFontSize, 300);
  }, false);

  win.addEventListener("pageshow", function(e) {
    if (e.persisted) {
      clearTimeout(timer);

      timer = setTimeout(setFontSize, 300);
    }
  }, false);
  // 初始化
  setFontSize();

}(window, document));

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Highly accurate version:

(function(WIN) {
    var  setFontSize = WIN.setFontSize = function (_width) {
        var  docEl = document.documentElement; 
        // 获取当前窗口的宽度
        var  width = _width || docEl.clientWidth; // docEl.getBoundingClientRect().width;

        // 大于 1080px 按 1080
        if (width > 1080) { 
            width = 1080;
        }

        var  rem = width / 10;
        console.log(rem);

        docEl.style.fontSize = rem + &#39;px&#39;;

        // 误差、兼容性处理
        var  actualSize = win.getComputedStyle && parseFloat(win.getComputedStyle(docEl)["font-size"]);
        if (actualSize !== rem && actualSize > 0 && Math.abs(actualSize - rem) > 1) {
            var remScaled = rem * rem / actualSize;
            docEl.style.fontSize = remScaled + &#39;px&#39;;
        }
    }

    var timer;

    function dbcRefresh() {
        clearTimeout(timer);
        timer = setTimeout(setFontSize, 100);
    }

    //窗口更新动态改变 font-size
    WIN.addEventListener(&#39;resize&#39;, dbcRefresh, false);
    //页面显示时计算一次
    WIN.addEventListener(&#39;pageshow&#39;, function(e) {
        if (e.persisted) { 
            dbcRefresh() 
        }
    }, false);
    setFontSize();
})(window)


//对H5活动推过页面，宽高比例有所要求，可适当调整

function adjustWarp(warpId = &#39;#warp&#39;) {

    const $win = $(window);
    const height = $win.height();
    let width = $win.width();

    // 考虑导航栏情况
    if (width / height < 360 / 600) {
        return;
    }

    width = Math.ceil(height * 360 / 640);

    $(warpId).css({
        height,
        width,
        postion: &#39;relative&#39;,
        top: 0,
        left: &#39;auto&#39;,
        margin: &#39;0 auto&#39;
    });

    // 重新计算 rem
    window.setFontSize(width);
}

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2 Set rem through CSS3 media query

Easy to use, lack of flexibility, please see demo you know

@media screen and ( min-width: 320px){html{font-size:50px}}
@media screen and ( min-width: 360px){html{font-size:56.25px}}
@media screen and ( min-width: 375px){html{font-size:58.59375px}}
@media screen and ( min-width: 384px){html{font-size:60px}}
@media screen and ( min-width: 400px){html{font-size:62.5px}}
@media screen and ( min-width: 414px){html{font-size:64.6875px}}
@media screen and ( min-width: 424px){html{font-size:66.25px}}
@media screen and ( min-width: 480px){html{font-size:75px}}
@media screen and ( min-width: 540px){html{font-size:84.375px}}
@media screen and ( min-width: 640px){html{font-size:100px}}

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can be modified appropriately according to personal project needs and product design. The above demo writing method is not unique and fixed.

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