動態進度條Javascript和HTML

Question

我想在使用javascript的HTML中創建一個動態欄。 我已經創建了按鈕，但似乎無法將值傳遞給進度條。 有人可以幫我嗎？謝謝！

<button onclick="increase()">Add</button> 
<button onclick="decrease()">Minus</button> 
<input type="text" id="tb"> 
<script type="text/javascript"> 
var value = 0 document.getElementById("tb").value = value; 
function increase(){ 
    this.value = value + 1; document.getElementById("tb").value=value;  
} 
function decrease(){ 
    this.value = value - 1; document.getElementById("tb").value=value; 
} 
document.write("<div class='meter'><span style='width: 30%'></span> </div>"); 
document.write("<input type='text' id=\"tb\">"+value +" </input>"); 
</script> 

Answer 1

它會更容易做到這一點jQuery的，但在這裏它去與POJS：

JS：

var value = 0, 
tb = document.getElementById("tb"), 
progress = document.getElementById("progress"); //store these, it's better 
function increase(){ 
    value++;// same as value += 1, but better 
    if(value>=100) value = 100;//keep it under 100% 
    tb.value = value;// set the value of the text field  
    progress.style.width = value + "%";// set the width of the progress bar 
} 
function decrease(){ 
    value--; 
    if(value<=0) value = 0;//keep it over 0% 
    tb.value = value; 
    progress.style.width = value + "%"; 
} 

document.write是janky，所以我拋棄這&把酒吧在標記中。

HTML：

<button onclick="increase()">Add</button> 
<button onclick="decrease()">Minus</button> 
<input type="text" id="tb"> 
<div id='meter'><div id='progress'></div></div> 

CSS：

​#meter {border:1px solid #000;width:100px} 
#progress {background:#333;height:10px;width:0%}​ 

撥弄：http://jsfiddle.net/sw95b/