JS完成代码前最好对其做5件事(2)

var collapser = (function(){
var config = {
indicatorClass : 'collapsible',
collapsedClass : 'collapsed',
collapseLabel : 'collapse',
expandLabel : 'expand'
}
var sections = document.getElementsByTagName('div');
for(var i=0,j=sections.length;i<j;i++){
if(sections[i].className.indexOf(config.indicatorClass) !== -1){
sections[i].className += ' ' + config.collapsedClass;
var paragraph = document.createElement('p');
var trigger = document.createElement('a');
trigger.setAttribute('href','#');
trigger.onclick = toggleSection;
trigger.appendChild(document.createTextNode(config.expandLabel));
paragraph.appendChild(trigger);
sections[i].parentNode.insertBefore(paragraph,sections[i]);
}
}
function toggleSection(){
var section = this.parentNode.nextSibling;
if(section.className.indexOf(config.collapsedClass) !== -1){
section.className = section.className.replace(' ' + config.collapsedClass,'');
this.firstChild.nodeValue = config.collapseLabel
} else {
section.className += ' ' + config.collapsedClass;
this.firstChild.nodeValue = config.expandLabel
}
return false;
}
})();

第五步：添加必要的注释

复制代码 代码如下:

// Collapse and expand section of the page with a certain class
// written by Christian Heilmann, 07/01/08
var collapser = (function(){
// Configuration, change CSS class names and labels here
var config = {
indicatorClass : 'collapsible',
collapsedClass : 'collapsed',
collapseLabel : 'collapse',
expandLabel : 'expand'
}
var sections = document.getElementsByTagName('div');
for(var i=0,j=sections.length;i<j;i++){
if(sections[i].className.indexOf(config.indicatorClass) !== -1){
sections[i].className += ' ' + config.collapsedClass;
var paragraph = document.createElement('p');
var trigger = document.createElement('a');
trigger.setAttribute('href','#');
trigger.onclick = toggleSection;
trigger.appendChild(document.createTextNode(config.expandLabel));
paragraph.appendChild(trigger);
sections[i].parentNode.insertBefore(paragraph,sections[i]);
}
}
function toggleSection(){
var section = this.parentNode.nextSibling;
if(section.className.indexOf(config.collapsedClass) !== -1){
section.className = section.className.replace(' ' + config.collapsedClass,'');
this.firstChild.nodeValue = config.collapseLabel
} else {
section.className += ' ' + config.collapsedClass;
this.firstChild.nodeValue = config.expandLabel
}
return false;
}
})();