js實現放大縮小頁面

<script type="text/JavaScript">

var size = 1.0;  
function zoomout() {  
 size = size + 0.1;  
 set(); 
}  


function zoomin() {  
 size = size - 0.1;  
 set();  
}  


function set() {  
 //document.body.style.cssText = document.body.style.cssText + `; -webkit-transform: scale(` + size + `);-webkit-transform-origin: 0 0;`;   
 //document.body.style.cssText = document.body.style.cssText + `; -webkit-transform: scale(` + size + `); `; 
 //$(body).css("width","120%);
document.body.style.zoom = size;
document.body.style.cssText += `; -moz-transform: scale(` + size + `);-moz-transform-origin: 0 0; `;     //
} 
    </script>