清除style
var str = '<p style="color:red;" class="box1">示例<em class="jusbc stsf">示例</em>程<strong>示例</strong>示例</p>' str = str.replace(/style\s*?=\s*?([‘"])[\s\S]*?\1/g, "");
清除class
var str = '<p style="color:red;" class="box1">示例<em class="jusbc stsf">示例</em>程<strong>示例</strong>示例</p>' str = str.replace(/class\s*?=\s*?([‘"])[\s\S]*?\1/g, "");