css3 给背景设置渐变色的方法

//浏览器前缀
background: lear-gradient(red, blue);
background: -webkit-lear-gradient(red, blue);
background: -o-lear-gradient(red, blue); 
background: -moz-lear-gradient(red, blue);

background:-webkit-lear-gradient(to , red, blue); 
background:lear-gradient(to ,red,blue);

background:-webkit-lear-gradient(to bottom, red, blue); 
background:lear-gradient(to bottom,red,blue);

background:-webkit-lear-gradient(to left, red, blue); 
background:lear-gradient(to left,red,blue);

background:-webkit-lear-gradient(to right, red, blue); 
background:lear-gradient(to right,red,blue);

background:-webkit-lear-gradient(to right, red, blue); 
background:lear-gradient(to right,red,blue);

background:-webkit-lear-gradient(to right, red, blue); 
background:lear-gradient(to right,red,blue);

background:-webkit-lear-gradient(to right, red, blue); 
background:lear-gradient(to right,red,blue);