Android--用JS去控制WebView显示的字体的大小

 <script type="text/javascript">
        function changeFontSize(size) {
            var tfs = '120%';
            var ifs = '100%';
            var tlh = '30px';
            var ilh = '18px';
            switch (size) {
                case 110:
                    tfs = '110%';
                    ifs = '90%';
                    tlh = '28px';
                    ilh = '16px';
                    break;
                case 120:
                    tfs = '120%';
                    ifs = '100%';
                    tlh = '30px';
                    ilh = '18px';
                    break;
                case 130:
                    tfs = '130%';
                    ifs = '110%';
                    tlh = '34px';
                    ilh = '22px';
                    break;
                case 140:
                    tfs = '140%';
                    ifs = '120%';
                    tlh = '38px';
                    ilh = '26px';
                    break;
                case 150:
                    tfs = '150%';
                    ifs = '130%';
                    tlh = '42px';
                    ilh = '30px';
                    break;
            }
            var pNodes = document.getElementsByTagName('p');
            for (var i = 0; i < pNodes.length; i++) {
                if (pNodes[i].className == 'imgtxt') {
                    pNodes[i].style.fontSize = ifs;
                    pNodes[i].style.lineHeight = ilh;
                }
                if (pNodes[i].className == 'txt') {
                    pNodes[i].style.fontSize = tfs;
                    pNodes[i].style.lineHeight = tlh;
                }
            }
        }
    </script>

然后我们用WebView去调用用这个方法就可以了，代码如下

WebView.loadurl("javascript:changeTextSize(size)");