勾选时激活input，否则禁用

window.onload =function(){
    var price = document.getElementById('price');
    price.disabled =true;
    price.style.padding ='2px 3px';
    price.style.background ='#eee';
    price.style.border ='1px solid #ccc';
    var tj = document.getElementById('tj');
    tj.onclick =function(){
        if(tj.checked ==true){ //可编辑
            price.disabled =false;
            price.style.background ='#fff';
            price.style.border ='2px solid #ff7d00';
            price.style.padding ='2px 3px';
            price.focus();
            
        } else {
            price.disabled =true;
            price.style.background ='#eee';
            price.style.border ='1px solid #ccc';
            price.style.padding ='2px 3px';
        }
    }
    
}