js 手机上键盘弹出挡住输入框

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var viewTop = document.body.scrollTop,
       viewBottom = viewTop + window.innerHeight;
           $("#intercom-container .intercom-composer textarea").on("focus", function(){
               window.setTimeout(function() {
                 window.scrollTo(0, viewBottom); // 调整value
              },200);
           })
           $("#intercom-container .intercom-composer textarea").on("blur", function(){
               window.setTimeout(function() {
                 window.scrollTo(0, viewTOP); // 调整value
              },200);
           })