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Ч¹ûͼ:

css²¿·Ö

    .tel_input.change::-webkit-input-placeholder {
      color: #499FF0;
    }

    .tel_input.change::-moz-placeholder {
      color: #499FF0;
    }

    .tel_input.change::-ms-input-placeholder {
      color: #499FF0;
    }

js²¿·Ö

    for (var i = 0; i < oInput.length; i++) {
        oInput[i].onfocus = function () {
          this.parentElement.style.borderBottom = "4px solid #499FF0"
          this.setAttribute('class', 'tel_input change')
        }
        oInput[i].onblur = function () {
          this.parentElement.style.borderBottom = "1px solid #499FF0"
          this.setAttribute('class', 'tel_input')
        }
      }