采用4步空格替换的方法来粗略提取HTML文本，分别为替换scr ipt脚本，替换style脚本，然后替换< > 尖括号中的标签内容，最后替换&... 一些转义的内容-Replace the spaces with four-step method to extract a rough HTML text, respectively, replace the scr ipt for the scr ipt, replace the style scr ipt, and then replace the < >　brackets in the labels, and finally replace the escape of some of the content & ...