js清除html 所有空格占位符   
清除富文本中所有   这些空格字符
html = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'
html.replace(/ /g,"").replace(/ /g,"").replace(/ /g,"")
清除富文本中所有   这些空格字符
html = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'
html.replace(/ /g,"").replace(/ /g,"").replace(/ /g,"")