html插入css

在html 页面插入css style

/**       * 添加css       */      function loadCssCode(code) {        var style = document.createElement("style");        style.type = "text/css";        style.rel = "stylesheet";        try {          //for Chrome Firefox Opera Safari          style.appendChild(document.createTextNode(code));        } catch (ex) {          //for IE          style.styleSheet.cssText = code;        }        var head = document.getElementsByTagName("head")[0];        head.appendChild(style);      }

var str = `
body{
  size:14px
}
`
loadCssCode(str)

css 

input[type="file"]{     display:none   }