function pageStrCount(str) {
    var count = 0 // 統(tǒng)計(jì)字?jǐn)?shù)
    var allStr = document.body.innerHTML // 網(wǎng)頁(yè)文字包含標(biāo)簽
    allStr = allStr.replace(/<\w+?>/g, '').replace(/<\/\w+?>/g, '') // 過(guò)濾網(wǎng)頁(yè)標(biāo)簽
    console.log(allStr)
    var reg = new RegExp(str, 'g') // 匹配的文字正則
    reg.exec(allStr)
    console.log(reg.lastIndex)
    while (reg.lastIndex) {
        count++
        reg.exec(allStr)
    }
    console.log('字?jǐn)?shù)統(tǒng)計(jì)結(jié)果：', count)
}