@font-face {
  font-family: fangzheng;
  src: url("../font/fangzheng.ttf");
  font-weight: normal;
  font-style: normal;
}
* {
  font-family: fangzheng;
  font-size: 1em;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
  -webkit-appearance: none;
}

when executing, report
< web font not found >
what is the situation? I have reduced the npm to 4.6. everything else can be compressed normally and the font is well displayed