input固定在底部

// input固定在底部
//isFocusing获取焦点：true 失去焦点:false

_onTouchInput(isFocusing){
    this.phone_width = screen.width;
    let Boxbottom = this.refs['InputBoxBottom'];
    let bottom_top = this.refs['bottom_top'];
    if(Boxbottom) {
        if (isFocusing) {
            Boxbottom.style.position = 'static';
            Boxbottom.style.width = (this.phone_width - 20) + 'px';
            Boxbottom.style.bottom = 0;
            bottom_top.style.paddingBottom = 0;

        } else {
            Boxbottom.style.position = 'fixed';
            bottom_top.style.paddingBottom = 64 + 'px';
            Boxbottom.style.width = (this.phone_width - 20) + 'px';
        }
    }
}