设置输入框的光标位置


function setCaret(el,start,end){
el.focus();
if(start === true){
start = el.value.length;
}
if(typeof end === 'undefined'){
end = start;
}else if(end === true){
end = el.value.length;
}
start = Math.max(0,start);
end = Math.min(end,el.value.length);
if ("setSelectionRange" in el) {
//Chrome/Firefox/IE9+/Safari3+/Opera8+
el.setSelectionRange(start, end);
}else{
//IE6~8
var userRange = document.selection.createRange();
userRange.moveStart("character",start);
userRange.moveEnd("character",end);
userRange.select();
}
}


//usage:
var i = document.getElementById('inputBox');
setCaret(i,0);//开始
setCaret(i,true);//结束

setCaret(i,1,5);//选中1~5个字符

setCaret(i,0,true);//选中所有值

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