JS调节页面的字体大小
var tgs = new Array( 'div','td','tr');
var szs = new Array( '12px','14px','16px','18px','20px' );
var startSz = 0;
function ts(inc,trgt) {
if (!document.getElementById) return
var d = document,cEl = null,sz = startSz,i,j,cTags;
sz += inc;
if ( sz < 0 ) sz = 0;
if ( sz > 4 ) sz = 4;
startSz = sz;
if(trgt == void 0){
cEl = d.body;
}else{
if ( !( cEl = d.getElementById( trgt ) ) ) cEl = d.getElementsByTagName( trgt )[ 0 ];
}
cEl.style.fontSize = szs[ sz ];
for ( i = 0 ; i < tgs.length ; i++ ) {
cTags = cEl.getElementsByTagName( tgs[ i ] );
for ( j = 0 ; j < cTags.length ; j++ ) cTags[ j ].style.fontSize = szs[ sz ];
}
}
var szs = new Array( '12px','14px','16px','18px','20px' );
var startSz = 0;
function ts(inc,trgt) {
if (!document.getElementById) return
var d = document,cEl = null,sz = startSz,i,j,cTags;
sz += inc;
if ( sz < 0 ) sz = 0;
if ( sz > 4 ) sz = 4;
startSz = sz;
if(trgt == void 0){
cEl = d.body;
}else{
if ( !( cEl = d.getElementById( trgt ) ) ) cEl = d.getElementsByTagName( trgt )[ 0 ];
}
cEl.style.fontSize = szs[ sz ];
for ( i = 0 ; i < tgs.length ; i++ ) {
cTags = cEl.getElementsByTagName( tgs[ i ] );
for ( j = 0 ; j < cTags.length ; j++ ) cTags[ j ].style.fontSize = szs[ sz ];
}
}
trgt是可选参数,用于指定只调整某个id为trgt的标签中的字体大小,如果省略了trgt,调整整个body。使用方法如:<a href="#" onclick="ts(-1,'header')"></a>