1.打开eclipse→Windows→Preferences→Java→Editor→Content Assist
修改Auto Activation triggers for java的值为：.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVW

2.JavaScript→Editor→Content Assist
修改Auto Activation triggers for javaScript的值为：.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVW

3.继续打开web→html Files→Editor→Content Assist
修改Prompt when these characters are inserted:的值为：<=.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVW

点击保存