1.打开eclipse→Windows→Preferences→Java→Editor→Content Assist
修改Auto Activation triggers for java的值为：.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVW 点击Apply按钮
如图：
2.
继续打开JavaScript→Editor→Content Assist
修改Auto Activation triggers for javaScript的值为：.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVW 点击Apply按钮
如图：
3.继续打开web→html Files→Editor→Content Assist
修改Prompt when these characters are inserted:的值为：<=.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVW 点击Apply按钮
如图：
所有设置完毕。